diff --git a/src/App.jsx b/src/App.jsx
index 264b37a..3efef2f 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -20,6 +20,10 @@ export default function App() {
   const [timeScale, setTimeScale] = useState(100);
   const [camSpeed, setCamSpeed] = useState(0.05);
   const [vrmModel, setVrmModel] = useState('ai.vrm');
+  const [lang, setLang] = useState('ja');
+  const langRef = useRef('ja');
+  const voiceIndexRef = useRef(0);
+  const voicePattern = ['normal','normal','normal','normal','normal','normal','normal','normal','skill','skill'];
   const actionIndexRef = useRef(0);
   const teleportIndexRef = useRef(0);
   const countRef = useRef(0);
@@ -28,11 +32,25 @@ export default function App() {
     return onAdminChange((v) => setIsAdmin(v));
   }, []);
 
+  const handleLangChange = useCallback((v) => { setLang(v); langRef.current = v; }, []);
+
+  const playSkillVoice = useCallback(() => {
+    const type = voicePattern[voiceIndexRef.current % voicePattern.length];
+    voiceIndexRef.current += 1;
+    const suffix = langRef.current === 'en' ? '_en' : '';
+    const file = `${import.meta.env.BASE_URL}voice/ai/${type}_1${suffix}.mp3`;
+    const audio = new Audio(file);
+    audio.volume = 0.7;
+    audio.play().catch(() => {});
+  }, []);
+
   const playAnim = useCallback((name) => {
     countRef.current += 1;
     setAnimState({ name, count: countRef.current });
   }, []);
 
+  const doSkillRef = useRef(null);
+
   const handleKey = useCallback((e) => {
     if (e.code === 'Escape') {
       setView(view === 'nasa' ? 'avatar' : 'nasa');
@@ -53,8 +71,7 @@ export default function App() {
       teleportIndexRef.current = idx + 1;
     } else if (e.code === 'KeyS') {
       e.preventDefault();
-      playAnim('skill');
-      setVrmModel(prev => prev === 'ai.vrm' ? 'ai_mode.vrm' : 'ai.vrm');
+      doSkillRef.current?.();
     }
   }, [playAnim, view]);
 
@@ -93,10 +110,16 @@ export default function App() {
     teleportIndexRef.current = idx + 1;
   }, [playAnim]);
 
+  const skillCoolRef = useRef(0);
   const doSkill = useCallback(() => {
+    const now = Date.now();
+    if (now - skillCoolRef.current < 3000) return;
+    skillCoolRef.current = now;
     playAnim('skill');
+    playSkillVoice();
     setVrmModel(prev => prev === 'ai.vrm' ? 'ai_mode.vrm' : 'ai.vrm');
-  }, [playAnim]);
+  }, [playAnim, playSkillVoice]);
+  doSkillRef.current = doSkill;
 
   const appStartRef = useRef(Date.now());
   const lastSwitchRef = useRef(0);
@@ -179,6 +202,8 @@ export default function App() {
           camSpeed={camSpeed}
           onCamSpeedChange={setCamSpeed}
           onSkill={doSkill}
+          lang={lang}
+          onLangChange={handleLangChange}
         />
       )}
 
diff --git a/src/VrmCharacter.jsx b/src/VrmCharacter.jsx
index 2fae135..cd30ad7 100644
--- a/src/VrmCharacter.jsx
+++ b/src/VrmCharacter.jsx
@@ -73,6 +73,14 @@ export default function VrmCharacter({ selectedAnimation: animState, vrmModel =
     const vrm = gltf.userData.vrm;
     vrmRef.current = vrm;
     VRMUtils.removeUnnecessaryJoints(vrm.scene);
+    // SpringBone: centerをRotatingStage(親group)に設定し、回転に追従させる
+    const sbm = vrm.springBoneManager;
+    if (sbm) {
+      const stageGroup = vrm.scene.parent;
+      sbm.joints?.forEach(joint => {
+        if (stageGroup) joint.center = stageGroup;
+      });
+    }
     vrm.humanoid.resetPose();
     vrm.scene.rotation.y = Math.PI;
 
diff --git a/src/ui/ControlPanel.jsx b/src/ui/ControlPanel.jsx
index db47537..b65e7b5 100644
--- a/src/ui/ControlPanel.jsx
+++ b/src/ui/ControlPanel.jsx
@@ -44,7 +44,7 @@ const btnStyle = {
   width: '100%',
 };
 
-export default function ControlPanel({ timeScale, onTimeScaleChange, camSpeed, onCamSpeedChange, onSkill }) {
+export default function ControlPanel({ timeScale, onTimeScaleChange, camSpeed, onCamSpeedChange, onSkill, lang, onLangChange }) {
   return (
     <div style={containerStyle}>
       <div>
@@ -77,8 +77,19 @@ export default function ControlPanel({ timeScale, onTimeScaleChange, camSpeed, o
           style={sliderStyle}
         />
       </div>
-      <button style={btnStyle} onClick={() => onSkill?.()}>
-        Skill
+      <button
+        style={{ ...btnStyle, display: 'flex', alignItems: 'center', justifyContent: 'center', gap: 6 }}
+        onClick={() => onSkill?.()}
+      >
+        <img src={`${import.meta.env.BASE_URL}icon/dot.svg`} alt="" style={{ width: 14, height: 14, filter: 'brightness(0) invert(1)', opacity: 0.7 }} />
+        <span>Skill</span>
+      </button>
+      <button
+        style={{ ...btnStyle, display: 'flex', alignItems: 'center', justifyContent: 'center', gap: 6 }}
+        onClick={() => onLangChange?.(lang === 'ja' ? 'en' : 'ja')}
+      >
+        <img src={`${import.meta.env.BASE_URL}icon/language.svg`} alt="" style={{ width: 14, height: 14, filter: 'brightness(0) invert(1)', opacity: 0.7 }} />
+        <span>{lang?.toUpperCase()}</span>
       </button>
     </div>
   );