diff --git a/src/modules/asset/application/blog-live2d-asset.service.ts b/src/modules/asset/application/blog-live2d-asset.service.ts
index e1ee2a1..9e14c36 100644
--- a/src/modules/asset/application/blog-live2d-asset.service.ts
+++ b/src/modules/asset/application/blog-live2d-asset.service.ts
@@ -1,4 +1,8 @@
-import { BadRequestException, Injectable } from '@nestjs/common';
+import {
+  BadRequestException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import { MinioClientService } from './asset-minio.service';
 import type {
@@ -11,6 +15,24 @@ const DEFAULT_LIVE2D_BUCKET = 'kt-template-online';
 const DEFAULT_LIVE2D_PREFIX = 'blog/live2d/pio';
 const MAX_DECODE_DEPTH = 6;
 
+/**
+ * Detects MinIO/S3 object-missing errors from `statObject` and `getObject`.
+ * @param error - Unknown failure thrown by the MinIO client while resolving a runtime object.
+ * @returns `true` when the failure means the requested object key does not exist.
+ */
+function isMinioObjectNotFound(error: unknown): boolean {
+  if (!error || typeof error !== 'object') {
+    return false;
+  }
+
+  const candidate = error as { code?: unknown; message?: unknown };
+  return (
+    candidate.code === 'NotFound' ||
+    candidate.code === 'NoSuchKey' ||
+    candidate.message === 'Not Found'
+  );
+}
+
 @Injectable()
 export class BlogLive2DAssetService {
   /**
@@ -54,10 +76,17 @@ export class BlogLive2DAssetService {
     version: string,
     objectPath: BlogLive2DRuntimeAssetPath,
   ): Promise<BlogLive2DAssetResult> {
-    return this.minioClientService.getObject(
-      this.resolveRuntimeObjectPath(version, objectPath),
-      this.getBucketName(),
-    );
+    try {
+      return await this.minioClientService.getObject(
+        this.resolveRuntimeObjectPath(version, objectPath),
+        this.getBucketName(),
+      );
+    } catch (error) {
+      if (isMinioObjectNotFound(error)) {
+        throw new NotFoundException('Live2D runtime asset not found');
+      }
+      throw error;
+    }
   }
 
   /**
diff --git a/test/asset/blog-live2d-asset.service.spec.ts b/test/asset/blog-live2d-asset.service.spec.ts
index 014afb2..e3e834a 100644
--- a/test/asset/blog-live2d-asset.service.spec.ts
+++ b/test/asset/blog-live2d-asset.service.spec.ts
@@ -117,6 +117,28 @@ describe('BlogLive2DAssetService', () => {
     );
   });
 
+  it('maps missing MinIO runtime objects to HTTP 404', async () => {
+    const minio = createMinio();
+    minio.getObject.mockRejectedValueOnce(
+      Object.assign(new Error('Not Found'), { code: 'NotFound' }),
+    );
+    const service = new BlogLive2DAssetService(
+      minio as never,
+      createConfig() as never,
+    );
+
+    await expect(
+      service.getRuntimeObject('v1', ['manifest.json']),
+    ).rejects.toMatchObject({
+      status: HttpStatus.NOT_FOUND,
+      message: 'Live2D runtime asset not found',
+    });
+    expect(minio.getObject).toHaveBeenCalledWith(
+      'blog/live2d/pio/v1/manifest.json',
+      'kt-template-online',
+    );
+  });
+
   it('rejects runtime path traversal before touching MinIO', async () => {
     const minio = createMinio();
     const service = new BlogLive2DAssetService(