diff --git a/src/rendering/cubismoffscreenrendertarget_webgl.ts b/src/rendering/cubismoffscreenrendertarget_webgl.ts
index d1efae0..1bb2254 100644
--- a/src/rendering/cubismoffscreenrendertarget_webgl.ts
+++ b/src/rendering/cubismoffscreenrendertarget_webgl.ts
@@ -204,8 +204,10 @@ export class CubismOffscreenRenderTarget_WebGL extends CubismRenderTarget_WebGL
   }
 
   public release(): void {
+    const borrowedFromManager = this._webGLOffscreenManager != null;
+
     if (
-      this._webGLOffscreenManager != null &&
+      borrowedFromManager &&
       this._gl != null &&
       this._renderTexture != null
     ) {
@@ -215,13 +217,17 @@ export class CubismOffscreenRenderTarget_WebGL extends CubismRenderTarget_WebGL
       );
     }
 
-    if (this._colorBuffer && this._gl) {
-      this._gl.deleteTexture(this._colorBuffer);
+    if (borrowedFromManager) {
+      // Color buffer and framebuffer are borrowed from CubismWebGLOffscreenManager.
+      // The manager owns GPU lifetime (releaseStaleRenderTextures / context teardown).
+      // Deleting them here double-frees the pool slot and can delete previousFramebuffer
+      // when setOffscreenRenderTarget stored it as a fallback.
       this._colorBuffer = null;
-    }
-    if (this._renderTexture && this._gl) {
-      this._gl.deleteFramebuffer(this._renderTexture);
       this._renderTexture = null;
+    } else if (this._gl) {
+      // Inherited createRenderTarget() locally owns the texture/FBO
+      // (_modelRenderTargets). destroyRenderTarget() is the matching owner.
+      this.destroyRenderTarget();
     }
 
     if (this._webGLOffscreenManager != null) {
diff --git a/src/rendering/cubismrenderer_webgl.ts b/src/rendering/cubismrenderer_webgl.ts
index 9520878..293ebe7 100644
--- a/src/rendering/cubismrenderer_webgl.ts
+++ b/src/rendering/cubismrenderer_webgl.ts
@@ -741,7 +741,8 @@ export class CubismRenderer_WebGL extends CubismRenderer {
 
     for (let i = 0; i < this._offscreenList.length; i++) {
       if (this._offscreenList[i] != null && this._offscreenList[i].isValid()) {
-        this._offscreenList[i].destroyRenderTarget();
+        // プールから借用した GPU オブジェクトは destroy しない
+        this._offscreenList[i].release();
       }
     }
     this._offscreenList.length = 0;