diff --git a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_forward_vertex.hlsl b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_forward_vertex.hlsl
index f7a74039e..b7dc73cac 100644
--- a/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_forward_vertex.hlsl
+++ b/Assets/VRMShaders/VRM10/MToon10/Resources/VRM10/vrmc_materials_mtoon_forward_vertex.hlsl
@@ -24,15 +24,16 @@ Varyings MToonVertex(const Attributes v) // v is UnityCG macro specified name.
         const VertexPositionInfo position = MToon_GetOutlineVertex(v.vertex.xyz, normalize(v.normalOS), output.uv);
         output.pos = position.positionCS;
         output.positionWS = position.positionWS;
+        output.normalWS = UnityObjectToWorldNormal(-v.normalOS);
     }
     else
     {
         const VertexPositionInfo position = MToon_GetVertex(v.vertex.xyz);
         output.pos = position.positionCS;
         output.positionWS = position.positionWS;
+        output.normalWS = UnityObjectToWorldNormal(v.normalOS);
     }
 
-    output.normalWS = UnityObjectToWorldNormal(v.normalOS);
     output.viewDirWS = MToon_GetWorldSpaceNormalizedViewDir(output.positionWS);
 
 #if defined(_NORMALMAP)