diff --git a/src/foundation/importer/ModelConverter.ts b/src/foundation/importer/ModelConverter.ts
index e27db52d1..4a6d3913a 100644
--- a/src/foundation/importer/ModelConverter.ts
+++ b/src/foundation/importer/ModelConverter.ts
@@ -601,12 +601,22 @@ export class ModelConverter {
 
         const rnPrimitive = new Primitive();
 
-        const material =
+        const rnMaterial =
           primitive.material != null
             ? rnMaterials[primitive.material]
             : this.__setupMaterial(gltfModel);
         setupMaterialVariants(rnPrimitive, primitive);
 
+        if (rnMaterial.materialTypeName.indexOf('MToon') !== -1) {
+          const VRMProperties = gltfModel.extensions.VRM;
+          const rnExtension = VRMProperties.rnExtension;
+          const renderPassOutline = rnExtension.renderPassOutline;
+          const outlineMaterial = primitive.materialObject?.extras?.outlineMaterial;
+          if (outlineMaterial != null) {
+            renderPassOutline.setMaterialForPrimitive(outlineMaterial, rnPrimitive);
+          }
+        }
+
         // indices
         let indicesRnAccessor;
         const map: Map<VertexAttributeSemanticsJoinedString, Accessor> = new Map();
@@ -654,7 +664,7 @@ export class ModelConverter {
           }
         }
 
-        rnPrimitive.setData(map, rnPrimitiveMode, material, indicesRnAccessor);
+        rnPrimitive.setData(map, rnPrimitiveMode, rnMaterial, indicesRnAccessor);
 
         // morph targets
         if (primitive.targets != null) {
@@ -833,7 +843,6 @@ export class ModelConverter {
 
   private static __setVRM1Material(
     gltfModel: RnM2,
-    // primitive: RnM2Primitive,
     materialJson: RnM2Material,
     rnLoaderOptions: GltfLoadOption
   ): Material | undefined {
@@ -887,7 +896,7 @@ export class ModelConverter {
           outlineMaterial = MaterialHelper.createEmptyMaterial();
         }
 
-        // renderPassOutline.setMaterialForPrimitive(outlineMaterial, rnPrimitive);
+        materialJson.extras!.outlineMaterial = outlineMaterial;
       }
 
       const material = MaterialHelper.createMToonMaterial({
@@ -970,7 +979,7 @@ export class ModelConverter {
           outlineMaterial = MaterialHelper.createEmptyMaterial();
         }
 
-        // renderPassOutline.setMaterialForPrimitive(outlineMaterial, rnPrimitive);
+        materialJson.extras!.outlineMaterial = outlineMaterial;
       }
 
       const material = MaterialHelper.createMToonMaterial({