diff --git a/README.md b/README.md
index fea1ca1..e7ec356 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,8 @@ This plugin analyzes video files to determine if they are anime content. Detecti
 | Field | Description |
 |-------|-------------|
 | `anime` | Boolean indicating if content is anime |
-| `titles/jpn` | Japanese title (if detected) |
-| `titles/rom` | Romanized title |
+| `titles/jpn/{name}` | `"true"` — Japanese title (if detected) |
+| `titles/jpl/{name}` | `"true"` — romaji title |
 | `genres` | Adds "Anime" to genres set |
 
 ## Dependencies
diff --git a/src/plugin.ts b/src/plugin.ts
index b4e9574..d0da6a5 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -8,8 +8,8 @@
  * - "anime" in file path
  *
  * Matches old AnimeDetector output:
- * - titles/jpn (if kana)
- * - titles/{romajiIsoCode} (if romaji)
+ * - titles/jpn/<name> (if kana) — key-set member, METADATA_KEYS.md §3
+ * - titles/{romajiIsoCode}/<name> (if romaji)
  * - anime
  * - genres (add "Anime")
  */
@@ -22,6 +22,16 @@ import { MetaCoreClient } from './meta-core-client.js';
 // romajiIsoCode from @metazla/meta-interface is just 'jpl'
 const romajiIsoCode = 'jpl';
 
+/**
+ * `titles/<lang3>/<name>` key-set member key (METADATA_KEYS.md §3): trimmed,
+ * whitespace collapsed, `/` (the key-set separator) written as U+2215 `∕`.
+ * `undefined` when nothing is left to name.
+ */
+export function titleMemberKey(lang3: string, name: string | undefined | null): string | undefined {
+    const clean = (name ?? '').trim().replace(/\s+/g, ' ').replace(/\//g, '\u2215');
+    return clean ? `titles/${lang3}/${clean}` : undefined;
+}
+
 export const manifest: PluginManifest = {
     id: 'anime-detector',
     name: 'Anime Detector',
@@ -35,8 +45,9 @@ export const manifest: PluginManifest = {
     timeout: 30000,
     schema: {
         anime: { label: 'Is Anime', type: 'boolean', readonly: true },
-        'titles/jpn': { label: 'Japanese Title', type: 'string' },
-        [`titles/${romajiIsoCode}`]: { label: 'Romaji Title', type: 'string' },
+        // Key-set members `titles/<lang3>/<name> = "true"` (METADATA_KEYS.md §3).
+        'titles/jpn/*': { label: 'Japanese Titles', type: 'boolean', readonly: true },
+        [`titles/${romajiIsoCode}/*`]: { label: 'Romaji Titles', type: 'boolean', readonly: true },
     },
     config: {},
 };
@@ -110,10 +121,10 @@ export async function process(
 
         // Set Japanese title appropriately
         if (isJpn && originalTitle) {
-            if (isKana(originalTitle)) {
-                await metaCore.setProperty(cid, 'titles/jpn', originalTitle);
-            } else {
-                await metaCore.setProperty(cid, `titles/${romajiIsoCode}`, originalTitle);
+            const lang3 = isKana(originalTitle) ? 'jpn' : romajiIsoCode;
+            const key = titleMemberKey(lang3, originalTitle);
+            if (key) {
+                await metaCore.mergeMetadata(cid, { [key]: 'true' });
             }
         }
 
diff --git a/test/integration.test.ts b/test/integration.test.ts
index d0207f9..4adc62f 100644
--- a/test/integration.test.ts
+++ b/test/integration.test.ts
@@ -12,6 +12,7 @@ import { animeKeywords } from '@metazla/filename-tools';
 // Dynamic import of plugin module
 let manifest: typeof import('../src/plugin.js').manifest;
 let processFile: typeof import('../src/plugin.js').process;
+let titleMemberKey: typeof import('../src/plugin.js').titleMemberKey;
 
 // Mock callback collector
 interface CallbackResult {
@@ -33,6 +34,7 @@ describe('Anime Detector Plugin Integration Tests', () => {
         const plugin = await import('../src/plugin.js');
         manifest = plugin.manifest;
         processFile = plugin.process;
+        titleMemberKey = plugin.titleMemberKey;
     });
 
     describe('Manifest', () => {
@@ -48,7 +50,14 @@ describe('Anime Detector Plugin Integration Tests', () => {
 
         it('declares correct schema', () => {
             expect(manifest.schema).toHaveProperty('anime');
-            expect(manifest.schema).toHaveProperty('titles/jpn');
+            expect(manifest.schema).toHaveProperty(['titles/jpn/*']);
+        });
+
+        it('builds titles key-set member keys', () => {
+            expect(titleMemberKey('jpn', '  ナルト ')).toBe('titles/jpn/ナルト');
+            expect(titleMemberKey('eng', 'Fate/Zero')).toBe('titles/eng/Fate\u2215Zero');
+            expect(titleMemberKey('jpl', 'Sousou  no\tFrieren')).toBe('titles/jpl/Sousou no Frieren');
+            expect(titleMemberKey('jpn', '   ')).toBeUndefined();
         });
     });