diff --git a/Assets/VRM/UniJSON/Editor/Tests/Json/JsonSerializerTests.cs b/Assets/VRM/UniJSON/Editor/Tests/Json/JsonSerializerTests.cs
index 0f497e9fb..50d4aef9f 100644
--- a/Assets/VRM/UniJSON/Editor/Tests/Json/JsonSerializerTests.cs
+++ b/Assets/VRM/UniJSON/Editor/Tests/Json/JsonSerializerTests.cs
@@ -83,6 +83,8 @@ namespace UniJSON
             SerializeValue(HogeFuga.Fuga, "1");
 
             SerializeValue(new EnumTest(), "{\"EnumDefault\":0,\"EnumAsInt\":0,\"EnumAsString\":\"Hoge\",\"EnumAsLowerString\":\"hoge\"}");
+
+            SerializeValue((object)new Point { X = 1 }, "{\"X\":1,\"Y\":0}");
         }
 
         [Test]
diff --git a/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs b/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs
new file mode 100644
index 000000000..1bbdd996d
--- /dev/null
+++ b/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs
@@ -0,0 +1,85 @@
+using System;
+using System.IO;
+using System.Text;
+using UnityEngine;
+using System.Reflection;
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
+
+namespace UniJSON
+{
+    public static partial class ConcreteCast
+    {
+        public static string GetMethodName(Type src, Type dst)
+        {
+            return string.Format("Cast{0}To{1}", src.Name, dst.Name);
+        }
+
+        public static MethodInfo GetMethod(Type src, Type dst)
+        {
+            var name = GetMethodName(src, dst);
+            var mi = typeof(ConcreteCast).GetMethod(name, 
+                BindingFlags.Static | BindingFlags.Public);
+            return mi;
+        }
+
+#if UNITY_EDITOR
+
+        static Type[] s_castTypes = new Type[]
+        {
+            typeof(byte),
+            typeof(ushort),
+            typeof(uint),
+            typeof(ulong),
+
+            typeof(sbyte),
+            typeof(short),
+            typeof(int),
+            typeof(long),
+
+            typeof(float),
+            typeof(double),
+        };
+
+        [MenuItem(UniGLTF.UniGLTFVersion.MENU + "/Generate ConcreteCast")]
+        public static void GenerateGenericCast()
+        {
+            var s = new StringBuilder();
+            using (var w = new StringWriter(s))
+            {
+                w.WriteLine(@"
+using System;
+
+namespace UniJSON {
+    public static partial class ConcreteCast
+    {
+");
+                foreach (var x in s_castTypes)
+                {
+                    foreach (var y in s_castTypes)
+                    {
+                        w.WriteLine(@"
+        public static $1 $2($0 src)
+        {
+            return ($1)src;
+        }
+".Replace("$0", x.Name).Replace("$1", y.Name).Replace("$2", GetMethodName(x, y)));
+                    }
+                }
+                w.WriteLine(@"
+    }
+}
+");
+            }
+
+            var path = Application.dataPath + SOURCE;
+            Debug.LogFormat("{0}", path);
+            File.WriteAllText(path, s.ToString().Replace("\r\n", "\n"), new UTF8Encoding(false));
+            AssetDatabase.ImportAsset("Assets" + SOURCE);
+        }
+        const string SOURCE = "/VRM/UniJSON/Scripts/ConcreteCast.g.cs";
+#endif
+    }
+}
diff --git a/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs.meta b/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs.meta
new file mode 100644
index 000000000..bf2b3f2da
--- /dev/null
+++ b/Assets/VRM/UniJSON/Scripts/ConcreteCast.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 7c7697929e4510048a5238dd9d227b2e
+timeCreated: 1549025672
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs b/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs
new file mode 100644
index 000000000..68f94c982
--- /dev/null
+++ b/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs
@@ -0,0 +1,611 @@
+
+using System;
+
+namespace UniJSON {
+    public static partial class ConcreteCast
+    {
+
+
+        public static Byte CastByteToByte(Byte src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastByteToUInt16(Byte src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastByteToUInt32(Byte src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastByteToUInt64(Byte src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastByteToSByte(Byte src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastByteToInt16(Byte src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastByteToInt32(Byte src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastByteToInt64(Byte src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastByteToSingle(Byte src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastByteToDouble(Byte src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastUInt16ToByte(UInt16 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastUInt16ToUInt16(UInt16 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastUInt16ToUInt32(UInt16 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastUInt16ToUInt64(UInt16 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastUInt16ToSByte(UInt16 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastUInt16ToInt16(UInt16 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastUInt16ToInt32(UInt16 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastUInt16ToInt64(UInt16 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastUInt16ToSingle(UInt16 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastUInt16ToDouble(UInt16 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastUInt32ToByte(UInt32 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastUInt32ToUInt16(UInt32 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastUInt32ToUInt32(UInt32 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastUInt32ToUInt64(UInt32 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastUInt32ToSByte(UInt32 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastUInt32ToInt16(UInt32 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastUInt32ToInt32(UInt32 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastUInt32ToInt64(UInt32 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastUInt32ToSingle(UInt32 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastUInt32ToDouble(UInt32 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastUInt64ToByte(UInt64 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastUInt64ToUInt16(UInt64 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastUInt64ToUInt32(UInt64 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastUInt64ToUInt64(UInt64 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastUInt64ToSByte(UInt64 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastUInt64ToInt16(UInt64 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastUInt64ToInt32(UInt64 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastUInt64ToInt64(UInt64 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastUInt64ToSingle(UInt64 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastUInt64ToDouble(UInt64 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastSByteToByte(SByte src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastSByteToUInt16(SByte src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastSByteToUInt32(SByte src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastSByteToUInt64(SByte src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastSByteToSByte(SByte src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastSByteToInt16(SByte src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastSByteToInt32(SByte src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastSByteToInt64(SByte src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastSByteToSingle(SByte src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastSByteToDouble(SByte src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastInt16ToByte(Int16 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastInt16ToUInt16(Int16 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastInt16ToUInt32(Int16 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastInt16ToUInt64(Int16 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastInt16ToSByte(Int16 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastInt16ToInt16(Int16 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastInt16ToInt32(Int16 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastInt16ToInt64(Int16 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastInt16ToSingle(Int16 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastInt16ToDouble(Int16 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastInt32ToByte(Int32 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastInt32ToUInt16(Int32 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastInt32ToUInt32(Int32 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastInt32ToUInt64(Int32 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastInt32ToSByte(Int32 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastInt32ToInt16(Int32 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastInt32ToInt32(Int32 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastInt32ToInt64(Int32 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastInt32ToSingle(Int32 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastInt32ToDouble(Int32 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastInt64ToByte(Int64 src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastInt64ToUInt16(Int64 src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastInt64ToUInt32(Int64 src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastInt64ToUInt64(Int64 src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastInt64ToSByte(Int64 src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastInt64ToInt16(Int64 src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastInt64ToInt32(Int64 src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastInt64ToInt64(Int64 src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastInt64ToSingle(Int64 src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastInt64ToDouble(Int64 src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastSingleToByte(Single src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastSingleToUInt16(Single src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastSingleToUInt32(Single src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastSingleToUInt64(Single src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastSingleToSByte(Single src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastSingleToInt16(Single src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastSingleToInt32(Single src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastSingleToInt64(Single src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastSingleToSingle(Single src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastSingleToDouble(Single src)
+        {
+            return (Double)src;
+        }
+
+
+        public static Byte CastDoubleToByte(Double src)
+        {
+            return (Byte)src;
+        }
+
+
+        public static UInt16 CastDoubleToUInt16(Double src)
+        {
+            return (UInt16)src;
+        }
+
+
+        public static UInt32 CastDoubleToUInt32(Double src)
+        {
+            return (UInt32)src;
+        }
+
+
+        public static UInt64 CastDoubleToUInt64(Double src)
+        {
+            return (UInt64)src;
+        }
+
+
+        public static SByte CastDoubleToSByte(Double src)
+        {
+            return (SByte)src;
+        }
+
+
+        public static Int16 CastDoubleToInt16(Double src)
+        {
+            return (Int16)src;
+        }
+
+
+        public static Int32 CastDoubleToInt32(Double src)
+        {
+            return (Int32)src;
+        }
+
+
+        public static Int64 CastDoubleToInt64(Double src)
+        {
+            return (Int64)src;
+        }
+
+
+        public static Single CastDoubleToSingle(Double src)
+        {
+            return (Single)src;
+        }
+
+
+        public static Double CastDoubleToDouble(Double src)
+        {
+            return (Double)src;
+        }
+
+
+    }
+}
+
diff --git a/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs.meta b/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs.meta
new file mode 100644
index 000000000..ad81e1c3c
--- /dev/null
+++ b/Assets/VRM/UniJSON/Scripts/ConcreteCast.g.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: d15ce8227d1aec64ab3fd82c4b271747
+timeCreated: 1549025426
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/UniJSON/Scripts/FormatterExtensions.cs b/Assets/VRM/UniJSON/Scripts/FormatterExtensions.cs
index c934b5031..467a588f4 100644
--- a/Assets/VRM/UniJSON/Scripts/FormatterExtensions.cs
+++ b/Assets/VRM/UniJSON/Scripts/FormatterExtensions.cs
@@ -45,6 +45,7 @@ namespace UniJSON
             return method.MakeGenericMethod(typeof(T));
         }
 
+        [Obsolete("error when AOT. use Key, Value")]
         public static void KeyValue<T>(this IFormatter f, Expression<Func<T>> expression)
         {
             var func = expression.Compile();
diff --git a/Assets/VRM/UniJSON/Scripts/FormatterExtensionsSerializer.cs b/Assets/VRM/UniJSON/Scripts/FormatterExtensionsSerializer.cs
index 94abead16..ca5b873c8 100644
--- a/Assets/VRM/UniJSON/Scripts/FormatterExtensionsSerializer.cs
+++ b/Assets/VRM/UniJSON/Scripts/FormatterExtensionsSerializer.cs
@@ -1,9 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Linq.Expressions;
 using System.Reflection;
 
+
 namespace UniJSON
 {
     public static class FormatterExtensionsSerializer
@@ -67,6 +67,11 @@ namespace UniJSON
         {
             GenericSerializer<T>.Set(serializer);
         }
+
+        public static MethodInfo GetMethod(string name)
+        {
+            return typeof(FormatterExtensionsSerializer).GetMethod(name);
+        }
     }
 
     static class GenericSerializer<T>
@@ -78,13 +83,8 @@ namespace UniJSON
             // object
             if (typeof(T) == typeof(object) && t.GetType() != typeof(object))
             {
-                var self = Expression.Parameter(typeof(IFormatter), "f");
-                var arg = Expression.Parameter(t, "value");
-                var call = Expression.Call(typeof(FormatterExtensionsSerializer), "SerializeObject",
-                    new Type[] { },
-                    self, arg);
-                var lambda = Expression.Lambda(call, self, arg);
-                return (Action<IFormatter, T>)lambda.Compile();
+                var mi = FormatterExtensionsSerializer.GetMethod("SerializeObject");
+                return GenericInvokeCallFactory.Create<IFormatter, T>(mi);
             }
 
             try
@@ -93,13 +93,7 @@ namespace UniJSON
                 var mi = typeof(IFormatter).GetMethod("Value", new Type[] { t });
                 if (mi != null)
                 {
-                    // primitives
-                    var self = Expression.Parameter(typeof(IFormatter), "f");
-                    var arg = Expression.Parameter(t, "value");
-                    var call = Expression.Call(self, mi, arg);
-
-                    var lambda = Expression.Lambda(call, self, arg);
-                    return (Action<IFormatter, T>)lambda.Compile();
+                    return GenericInvokeCallFactory.Create<IFormatter, T>(mi);
                 }
             }
             catch (AmbiguousMatchException)
@@ -116,14 +110,8 @@ namespace UniJSON
                 );
                 if (idictionary != null)
                 {
-                    //var mi = typeof(IFormatter).GetMethod("SerializeDictionary", new Type[] { t });
-                    var self = Expression.Parameter(typeof(IFormatter), "f");
-                    var arg = Expression.Parameter(t, "value");
-                    var call = Expression.Call(typeof(FormatterExtensionsSerializer), "SerializeDictionary",
-                        new Type[] { },
-                        self, arg);
-                    var lambda = Expression.Lambda(call, self, arg);
-                    return (Action<IFormatter, T>)lambda.Compile();
+                    var mi = FormatterExtensionsSerializer.GetMethod("SerializeDictionary");
+                    return GenericInvokeCallFactory.Create<IFormatter, T>(mi);
                 }
             }
 
@@ -131,13 +119,8 @@ namespace UniJSON
                 // object[]
                 if (t == typeof(object[]))
                 {
-                    var self = Expression.Parameter(typeof(IFormatter), "f");
-                    var arg = Expression.Parameter(t, "value");
-                    var call = Expression.Call(typeof(FormatterExtensionsSerializer), "SerializeObjectArray",
-                        new Type[] { },
-                        self, arg);
-                    var lambda = Expression.Lambda(call, self, arg);
-                    return (Action<IFormatter, T>)lambda.Compile();
+                    var mi = FormatterExtensionsSerializer.GetMethod("SerializeObjectArray");
+                    return GenericInvokeCallFactory.Create<IFormatter, T>(mi);
                 }
             }
 
@@ -149,13 +132,9 @@ namespace UniJSON
                 );
                 if (ienumerable != null)
                 {
-                    var self = Expression.Parameter(typeof(IFormatter), "f");
-                    var arg = Expression.Parameter(t, "value");
-                    var call = Expression.Call(typeof(FormatterExtensionsSerializer), "SerializeArray",
-                        ienumerable.GetGenericArguments(),
-                        self, arg);
-                    var lambda = Expression.Lambda(call, self, arg);
-                    return (Action<IFormatter, T>)lambda.Compile();
+                    var g = FormatterExtensionsSerializer.GetMethod("SerializeArray");
+                    var mi = g.MakeGenericMethod(ienumerable.GetGenericArguments());
+                    return GenericInvokeCallFactory.Create<IFormatter, T>(mi);
                 }
             }
 
diff --git a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.cs b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.cs
index 4acafd1e5..fa8fd8b1f 100644
--- a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.cs
+++ b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.cs
@@ -49,13 +49,13 @@ namespace UniJSON
                     var a = String.Join(", ", GetArgs("a", i).ToArray());
 
                     var source = @"
-        public static Delegate Create<S, $0>(MethodInfo m)
+        public static Action<S, $0> Create<S, $0>(MethodInfo m)
         {
             var self = Expression.Parameter(m.DeclaringType, m.Name);
             var args = m.GetParameters().Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToArray();
             var call = Expression.Call(self, m, args);
             return 
-                Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
+                (Action<S, $0>)Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
         }
 ".Replace("$0", g).Replace("$1", a);
 
@@ -68,7 +68,7 @@ namespace UniJSON
                     var g = String.Join(", ", GetArgs("A", i).ToArray());
 
                     var source = @"
-        public static Delegate CreateWithThis<S, $0>(MethodInfo m, S instance)
+        public static Action<$0> CreateWithThis<S, $0>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -97,7 +97,7 @@ namespace UniJSON
                 call = Expression.Call(self, m, args);
             }
             return 
-                Expression.Lambda(call, args).Compile();
+                (Action<$0>)Expression.Lambda(call, args).Compile();
         }
 ".Replace("$0", g);
 
diff --git a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.g.cs b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.g.cs
index 8dae56f0e..5415ced57 100644
--- a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.g.cs
+++ b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericExpressionCallFactory.g.cs
@@ -11,37 +11,37 @@ namespace UniJSON
     {
 
 
-        public static Delegate Create<S, A0>(MethodInfo m)
+        public static Action<S, A0> Create<S, A0>(MethodInfo m)
         {
             var self = Expression.Parameter(m.DeclaringType, m.Name);
             var args = m.GetParameters().Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToArray();
             var call = Expression.Call(self, m, args);
             return 
-                Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
+                (Action<S, A0>)Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
         }
 
 
-        public static Delegate Create<S, A0, A1>(MethodInfo m)
+        public static Action<S, A0, A1> Create<S, A0, A1>(MethodInfo m)
         {
             var self = Expression.Parameter(m.DeclaringType, m.Name);
             var args = m.GetParameters().Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToArray();
             var call = Expression.Call(self, m, args);
             return 
-                Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
+                (Action<S, A0, A1>)Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
         }
 
 
-        public static Delegate Create<S, A0, A1, A2>(MethodInfo m)
+        public static Action<S, A0, A1, A2> Create<S, A0, A1, A2>(MethodInfo m)
         {
             var self = Expression.Parameter(m.DeclaringType, m.Name);
             var args = m.GetParameters().Select(x => Expression.Parameter(x.ParameterType, x.Name)).ToArray();
             var call = Expression.Call(self, m, args);
             return 
-                Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
+                (Action<S, A0, A1, A2>)Expression.Lambda(call, new[] { self }.Concat(args).ToArray()).Compile();
         }
 
 
-        public static Delegate CreateWithThis<S, A0>(MethodInfo m, S instance)
+        public static Action<A0> CreateWithThis<S, A0>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -70,11 +70,11 @@ namespace UniJSON
                 call = Expression.Call(self, m, args);
             }
             return 
-                Expression.Lambda(call, args).Compile();
+                (Action<A0>)Expression.Lambda(call, args).Compile();
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1>(MethodInfo m, S instance)
+        public static Action<A0, A1> CreateWithThis<S, A0, A1>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -103,11 +103,11 @@ namespace UniJSON
                 call = Expression.Call(self, m, args);
             }
             return 
-                Expression.Lambda(call, args).Compile();
+                (Action<A0, A1>)Expression.Lambda(call, args).Compile();
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1, A2>(MethodInfo m, S instance)
+        public static Action<A0, A1, A2> CreateWithThis<S, A0, A1, A2>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -136,11 +136,11 @@ namespace UniJSON
                 call = Expression.Call(self, m, args);
             }
             return 
-                Expression.Lambda(call, args).Compile();
+                (Action<A0, A1, A2>)Expression.Lambda(call, args).Compile();
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1, A2, A3>(MethodInfo m, S instance)
+        public static Action<A0, A1, A2, A3> CreateWithThis<S, A0, A1, A2, A3>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -169,7 +169,7 @@ namespace UniJSON
                 call = Expression.Call(self, m, args);
             }
             return 
-                Expression.Lambda(call, args).Compile();
+                (Action<A0, A1, A2, A3>)Expression.Lambda(call, args).Compile();
         }
 
 
diff --git a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.cs b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.cs
index 497cbbad6..76cd2528c 100644
--- a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.cs
+++ b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.cs
@@ -54,13 +54,23 @@ namespace UniJSON
 
 
                     var source = @"
-        public static Delegate Create<S, $0>(MethodInfo m)
+        public static Action<S, $0> Create<S, $0>(MethodInfo m)
         {
-            Action<S, $0> callback=
-            (s, $1) =>
+            Action<S, $0> callback = null;
+            if (m.IsStatic)
             {
-                m.Invoke(s, new object[] { $1 });
-            };
+                callback = (s, $1) =>
+                {
+                    m.Invoke(null, new object[] { s, $1 });
+                };
+            }
+            else
+            {
+                callback = (s, $1) =>
+                {
+                    m.Invoke(s, new object[] { $1 });
+                };
+            }
             return callback;
         }
 ".Replace("$0", g).Replace("$1", a);
@@ -78,7 +88,7 @@ namespace UniJSON
                     var a = String.Join(", ", GetArgs("a", i).ToArray());
 
                     var source = @"
-        public static Delegate CreateWithThis<S, $0>(MethodInfo m, S instance)
+        public static Action<$0> CreateWithThis<S, $0>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
diff --git a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.g.cs b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.g.cs
index 7a63001fc..ce26ca6d5 100644
--- a/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.g.cs
+++ b/Assets/VRM/UniJSON/Scripts/GenericCallUtility/GenericInvokeCallFactory.g.cs
@@ -10,41 +10,71 @@ namespace UniJSON
 
 //////////// Create
 
-        public static Delegate Create<S, A0>(MethodInfo m)
+        public static Action<S, A0> Create<S, A0>(MethodInfo m)
         {
-            Action<S, A0> callback=
-            (s, a0) =>
+            Action<S, A0> callback = null;
+            if (m.IsStatic)
             {
-                m.Invoke(s, new object[] { a0 });
-            };
+                callback = (s, a0) =>
+                {
+                    m.Invoke(null, new object[] { s, a0 });
+                };
+            }
+            else
+            {
+                callback = (s, a0) =>
+                {
+                    m.Invoke(s, new object[] { a0 });
+                };
+            }
             return callback;
         }
 
 
-        public static Delegate Create<S, A0, A1>(MethodInfo m)
+        public static Action<S, A0, A1> Create<S, A0, A1>(MethodInfo m)
         {
-            Action<S, A0, A1> callback=
-            (s, a0, a1) =>
+            Action<S, A0, A1> callback = null;
+            if (m.IsStatic)
             {
-                m.Invoke(s, new object[] { a0, a1 });
-            };
+                callback = (s, a0, a1) =>
+                {
+                    m.Invoke(null, new object[] { s, a0, a1 });
+                };
+            }
+            else
+            {
+                callback = (s, a0, a1) =>
+                {
+                    m.Invoke(s, new object[] { a0, a1 });
+                };
+            }
             return callback;
         }
 
 
-        public static Delegate Create<S, A0, A1, A2>(MethodInfo m)
+        public static Action<S, A0, A1, A2> Create<S, A0, A1, A2>(MethodInfo m)
         {
-            Action<S, A0, A1, A2> callback=
-            (s, a0, a1, a2) =>
+            Action<S, A0, A1, A2> callback = null;
+            if (m.IsStatic)
             {
-                m.Invoke(s, new object[] { a0, a1, a2 });
-            };
+                callback = (s, a0, a1, a2) =>
+                {
+                    m.Invoke(null, new object[] { s, a0, a1, a2 });
+                };
+            }
+            else
+            {
+                callback = (s, a0, a1, a2) =>
+                {
+                    m.Invoke(s, new object[] { a0, a1, a2 });
+                };
+            }
             return callback;
         }
 
 //////////// CreateWithThis
 
-        public static Delegate CreateWithThis<S, A0>(MethodInfo m, S instance)
+        public static Action<A0> CreateWithThis<S, A0>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -70,7 +100,7 @@ namespace UniJSON
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1>(MethodInfo m, S instance)
+        public static Action<A0, A1> CreateWithThis<S, A0, A1>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -96,7 +126,7 @@ namespace UniJSON
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1, A2>(MethodInfo m, S instance)
+        public static Action<A0, A1, A2> CreateWithThis<S, A0, A1, A2>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
@@ -122,7 +152,7 @@ namespace UniJSON
         }
 
 
-        public static Delegate CreateWithThis<S, A0, A1, A2, A3>(MethodInfo m, S instance)
+        public static Action<A0, A1, A2, A3> CreateWithThis<S, A0, A1, A2, A3>(MethodInfo m, S instance)
         {
             if (m.IsStatic)
             {
diff --git a/Assets/VRM/UniJSON/Scripts/GenericCast.cs b/Assets/VRM/UniJSON/Scripts/GenericCast.cs
index 2fd4e80a1..890172611 100644
--- a/Assets/VRM/UniJSON/Scripts/GenericCast.cs
+++ b/Assets/VRM/UniJSON/Scripts/GenericCast.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Linq.Expressions;
 
 
 namespace UniJSON
@@ -43,37 +42,34 @@ namespace UniJSON
         }
     }
 
-    static class GenericCast
+    static partial class GenericCast
     {
         public static Func<S, T> CreateCast<S, T>()
         {
-            if (typeof(S) == typeof(T))
+            var mi = ConcreteCast.GetMethod(typeof(S), typeof(T));
+            if (mi == null)
             {
-                // through
-                var src = Expression.Parameter(typeof(S), "src");
-                var lambda = Expression.Lambda(src, src);
-                return (Func<S, T>)lambda.Compile();
+                return (Func<S, T>)((S s) =>
+                {
+                    return (T)(object)s;
+                });
             }
             else
             {
-                // cast
-                var src = Expression.Parameter(typeof(S), "src");
-                var cast = Expression.Convert(src, typeof(T));
-                var lambda = Expression.Lambda(cast, src);
-                return (Func<S, T>)lambda.Compile();
+                return (Func<S, T>)((S s) =>
+                {
+                    return (T)mi.Invoke(null, new object[] { s });
+                });
             }
         }
 
         public static Func<S, Func<T>> CreateConst<S, T>()
         {
-            var src = Expression.Parameter(typeof(S), "src");
-            var convert = Expression.Convert(src, typeof(T));
-            var lambda = (Func<S, T>)Expression.Lambda(convert, src).Compile();
-            return s =>
+            var cast = CreateCast<S, T>();
+            return (Func<S, Func<T>>)((S s) =>
             {
-                var t = lambda(s);
-                return () => t;
-            };
+                return (Func<T>)(() => cast(s));
+            });
         }
     }
 }
diff --git a/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonArrayValidator.cs b/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonArrayValidator.cs
index 65a7df587..2859ebd2b 100644
--- a/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonArrayValidator.cs
+++ b/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonArrayValidator.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Linq.Expressions;
 using System.Reflection;
 
 
@@ -116,17 +115,19 @@ namespace UniJSON
                     if (t.IsArray)
                     {
                         var pi = t.GetProperty("Length");
-                        var v = Expression.Parameter(t, "value");
-                        var call = Expression.Property(v, pi);
-                        var compiled = (Func<T, int>)Expression.Lambda(call, v).Compile();
+                        var compiled = (Func<T, int>)((T array) =>
+                        {
+                            return (int)pi.GetValue(array, null);
+                        });
                         s_counter = new Counter(compiled);
                     }
                     else if (t.GetIsGenericList())
                     {
                         var pi = t.GetProperty("Count");
-                        var v = Expression.Parameter(t, "value");
-                        var call = Expression.Property(v, pi);
-                        var compiled = (Func<T, int>)Expression.Lambda(call, v).Compile();
+                        var compiled = (Func<T, int>)((T list) =>
+                        {
+                            return (int)pi.GetValue(list, null);
+                        });
                         s_counter = new Counter(compiled);
                     }
                     else
@@ -257,12 +258,17 @@ namespace UniJSON
                     {
                         throw new NotImplementedException();
                     }
-                    var vv = Expression.Parameter(typeof(IJsonSchemaValidator), "v");
-                    var ff = Expression.Parameter(typeof(IFormatter), "f");
-                    var cc = Expression.Parameter(typeof(JsonSchemaValidationContext), "c");
-                    var oo = Expression.Parameter(typeof(T), "o");
-                    var call = Expression.Call(g, vv, ff, cc, oo);
-                    var compiled = (Action<IJsonSchemaValidator, IFormatter, JsonSchemaValidationContext, T>)Expression.Lambda(call, vv, ff, cc, oo).Compile();
+
+                    var compiled = (Action<
+                        IJsonSchemaValidator, 
+                        IFormatter, 
+                        JsonSchemaValidationContext, 
+                        T>)
+                        GenericInvokeCallFactory.Create<
+                            IJsonSchemaValidator, 
+                            IFormatter, 
+                            JsonSchemaValidationContext, 
+                            T>(g);
                     s_serializer = new Serializer(compiled);
                 }
                 s_serializer(v, f, c, o);
diff --git a/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonEnumValidator.cs b/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonEnumValidator.cs
index 8c6325ae0..4cd4ec7d8 100644
--- a/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonEnumValidator.cs
+++ b/Assets/VRM/UniJSON/Scripts/JsonSchemaValidator/JsonEnumValidator.cs
@@ -1,9 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Linq.Expressions;
 using System.Reflection;
 
+
 namespace UniJSON
 {
     public static class JsonEnumValidator
@@ -304,8 +304,8 @@ namespace UniJSON
             GenericSerializer<T>.Serialize(this, f, c, o);
         }
 
-        static class GenericDeserializer<T, U> 
-            where T: IListTreeItem, IValue<T>
+        static class GenericDeserializer<T, U>
+            where T : IListTreeItem, IValue<T>
         {
             delegate U Deserializer(ListTreeNode<T> src);
             static Deserializer s_d;
@@ -319,13 +319,11 @@ namespace UniJSON
                         var mi = typeof(Enum).GetMethods(BindingFlags.Static | BindingFlags.Public).First(
                             x => x.Name == "Parse" && x.GetParameters().Length == 3
                             );
-                        var type = Expression.Constant(typeof(U));
-                        var value = Expression.Parameter(typeof(string), "value");
-                        var ic = Expression.Constant(true);
-                        var call = Expression.Call(mi, type, value, ic);
-                        var lambda = Expression.Lambda(call, value);
-                        var func = (Func<string, object>)lambda.Compile();
-                        s_d = x => GenericCast<object, U>.Cast(func(x.GetString()));
+                        s_d = x =>
+                        {
+                            var enumValue = mi.Invoke(null, new object[] { typeof(U), x.GetString(), true });
+                            return GenericCast<object, U>.Cast(enumValue);
+                        };
                     }
                     else
                     {
@@ -336,7 +334,7 @@ namespace UniJSON
             }
         }
 
-        public void Deserialize<T, U>(ListTreeNode<T> src, ref U dst) 
+        public void Deserialize<T, U>(ListTreeNode<T> src, ref U dst)
             where T : IListTreeItem, IValue<T>
         {
             GenericDeserializer<T, U>.Deserialize(src, ref dst);
@@ -414,7 +412,7 @@ namespace UniJSON
             f.Serialize(GenericCast<T, int>.Cast(o));
         }
 
-        static class GenericDeserializer<T, U> 
+        static class GenericDeserializer<T, U>
             where T : IListTreeItem, IValue<T>
         {
             delegate U Deserializer(ListTreeNode<T> src);
@@ -426,17 +424,13 @@ namespace UniJSON
                 if (s_d == null)
                 {
                     // enum from int
-                    var value = Expression.Parameter(typeof(int), "value");
-                    var cast = Expression.Convert(value, typeof(U));
-                    var lambda = Expression.Lambda(cast, value);
-                    var func = (Func<int, U>)lambda.Compile();
-                    s_d = s => func(s.GetInt32());
+                    s_d = s => GenericCast<int, U>.Cast(s.GetInt32());
                 }
                 dst = s_d(src);
             }
         }
 
-        public void Deserialize<T, U>(ListTreeNode<T> src, ref U dst) 
+        public void Deserialize<T, U>(ListTreeNode<T> src, ref U dst)
             where T : IListTreeItem, IValue<T>
         {
             GenericDeserializer<T, U>.Deserialize(src, ref dst);