diff --git a/apps/desktop/layer/main/src/ipc/services/integration.test.ts b/apps/desktop/layer/main/src/ipc/services/integration.test.ts
new file mode 100644
index 000000000..75af50f4c
--- /dev/null
+++ b/apps/desktop/layer/main/src/ipc/services/integration.test.ts
@@ -0,0 +1,74 @@
+import fsp from "node:fs/promises"
+import os from "node:os"
+
+import type { IpcContext } from "electron-ipc-decorator"
+import path from "pathe"
+import { afterEach, describe, expect, it, vi } from "vitest"
+
+import { IntegrationService } from "./integration"
+
+vi.mock("electron", () => ({
+  ipcMain: {
+    handle: vi.fn(),
+  },
+  shell: {
+    openExternal: vi.fn(),
+  },
+}))
+
+vi.mock("electron-ipc-decorator", () => ({
+  IpcMethod: () => (_target: unknown, _propertyKey: string, descriptor: PropertyDescriptor) =>
+    descriptor,
+  IpcService: class {},
+}))
+
+vi.mock("~/lib/store", () => ({
+  store: {
+    get: vi.fn(),
+    set: vi.fn(),
+  },
+}))
+
+vi.mock("~/logger", () => ({
+  logger: {
+    debug: vi.fn(),
+    error: vi.fn(),
+    info: vi.fn(),
+    warn: vi.fn(),
+  },
+}))
+
+describe("IntegrationService", () => {
+  let vaultPath: string | undefined
+
+  afterEach(async () => {
+    if (!vaultPath) return
+
+    await fsp.rm(vaultPath, { force: true, recursive: true })
+    vaultPath = undefined
+  })
+
+  it("saves Obsidian titles with path separators as one markdown file", async () => {
+    vaultPath = await fsp.mkdtemp(path.join(os.tmpdir(), "folo-obsidian-"))
+    const service = new IntegrationService()
+    const context = {} as IpcContext
+
+    await expect(
+      service.saveToObsidian(context, {
+        url: "https://example.com",
+        title: "KAWA DESIGN 少女前线2：追放 索米·雪兔献礼 1/6比例手办",
+        content: "content",
+        author: "Folo",
+        publishedAt: "2026-05-14T04:20:44.405Z",
+        vaultPath,
+      }),
+    ).resolves.toEqual({ success: true })
+
+    await expect(fsp.readdir(vaultPath)).resolves.toEqual([
+      "KAWA DESIGN 少女前线2：追放 索米·雪兔献礼 1_6比例手办.md",
+    ])
+    await expect(
+      fsp.stat(path.join(vaultPath, "KAWA DESIGN 少女前线2：追放 索米·雪兔献礼 1")),
+    ).rejects.toThrow()
+  })
+})
diff --git a/apps/desktop/layer/main/src/ipc/services/integration.ts b/apps/desktop/layer/main/src/ipc/services/integration.ts
index d0164fe04..a44a52aec 100644
--- a/apps/desktop/layer/main/src/ipc/services/integration.ts
+++ b/apps/desktop/layer/main/src/ipc/services/integration.ts
@@ -14,7 +14,7 @@ import { createObsidianFrontmatter } from "./obsidian-frontmatter"
 // Taken from https://github.com/rollup/rollup/blob/4f69d33af3b2ec9320c43c9e6c65ea23a02bdde3/src/utils/sanitizeFileName.ts
 // https://datatracker.ietf.org/doc/html/rfc2396
 // eslint-disable-next-line no-control-regex
-const INVALID_CHAR_REGEX = /[\u0000-\u001F"#$%&*+,:;<=>?[\]^`{|}\u007F]/g
+const INVALID_CHAR_REGEX = /[\u0000-\u001F"#$%&*+,:;<=>?[\]^`{|}\u007F/\\]/g
 const DRIVE_LETTER_REGEX = /^[a-z]:/i
 
 function sanitizeFileName(name: string): string {