diff --git a/frontend/src/pages/ShowsPage.tsx b/frontend/src/pages/ShowsPage.tsx
index 83e5c39..f551934 100644
--- a/frontend/src/pages/ShowsPage.tsx
+++ b/frontend/src/pages/ShowsPage.tsx
@@ -1,4 +1,5 @@
-import { useEffect, useMemo, useState } from "react";
+import { useEffect, useMemo, useState, useRef } from "react";
+import { useNavigate } from "react-router-dom";
 import { API_ENDPOINT } from "../api/endpoint";
 
 type Show = {
@@ -13,6 +14,7 @@ type Show = {
 
 const GET_URL = API_ENDPOINT.v1.SHOWS;
 const POST_URL = API_ENDPOINT.v1.CURRENT;
+const REDIRECT_DELAY_S = 3;
 
 const HHMM = /^(\d{1,2}):([0-5]\d)$/;
 
@@ -37,11 +39,34 @@ export default function ShowsPage() {
     const [loading, setLoading] = useState(true);
     const [posting, setPosting] = useState(false);
     const [error, setError] = useState<string | null>(null);
+    const [redirectIn, setRedirectIn] = useState<number | null>(null);
+    const redirectTid = useRef<number | null>(null);
+    const isRedirecting = redirectIn !== null;
+    const navigate = useNavigate();
 
     // フォーム状態
     const [selectedId, setSelectedId] = useState<number | null>(null);
     const [startTime, setStartTime] = useState("");
 
+    function formatPlaybackLen(v: string): string {
+        const parts = v.split(":").map(Number);
+        if (parts.length === 2) {
+            // already MM:SS
+            const [mm, ss] = parts;
+            return `${String(mm).padStart(2, "0")}:${String(ss).padStart(2, "0")}`;
+        }
+        if (parts.length === 3) {
+            const [hh, mm, ss] = parts;
+            if (hh <= 0) {
+                // show MM:SS when hours are zero
+                return `${String(mm).padStart(2, "0")}:${String(ss).padStart(2, "0")}`;
+            }
+            // show HH:MM:SS when hours exist
+            return `${String(hh).padStart(2, "0")}:${String(mm).padStart(2, "0")}:${String(ss).padStart(2, "0")}`;
+        }
+        return v; // fallback (unexpected format)
+    }
+
     // 一覧取得
     useEffect(() => {
         let cancelled = false;
@@ -51,7 +76,8 @@ export default function ShowsPage() {
                 const res = await fetch(GET_URL, { cache: "no-store" });
                 if (!res.ok) throw new Error(`HTTP ${res.status}`);
                 const data = (await res.json()) as Show[];
-                if (!cancelled) setShows(data);
+                data.sort((a, b) => a.id - b.id);   // ASC
+                setShows(data);
             } catch (e: any) {
                 if (!cancelled) setError(e.message || "番組一覧の取得に失敗しました。");
             } finally {
@@ -60,6 +86,13 @@ export default function ShowsPage() {
         })();
         return () => { cancelled = true; };
     }, []);
+    useEffect(() => {
+        return () => {
+            if (redirectTid.current) {
+                window.clearInterval(redirectTid.current);
+            }
+        };
+    }, []);
 
     const current = useMemo(() => shows.find(s => s.id === selectedId) || null, [shows, selectedId]);
 
@@ -67,12 +100,17 @@ export default function ShowsPage() {
         setError(null);
         if (!selectedId) { setError("エピソードを選択してください。"); return; }
 
-        let payload: any = { id: selectedId };
+        const selected = shows.find(s => s.id === selectedId);
+        if (!selected) { setError("選択中のエピソードが見つかりません。"); return; }
 
-        if (startTime) {
+        const payload: any = { id: selectedId };
+
+        if (startTime.trim()) {
             const normalized = toHHMMSS(startTime);
             if (!normalized) { setError("開始時刻は HH:MM の形式で入力してください。"); return; }
-            payload.start_time = normalized;  // API expects HH:MM:SS
+            payload.start_time = normalized;
+        } else {
+            payload.start_time = selected.start_time;
         }
 
         try {
@@ -83,7 +121,13 @@ export default function ShowsPage() {
                 body: JSON.stringify(payload),
             });
             if (!res.ok) throw new Error(`POST 失敗 (${res.status})`);
-            setStartTime("");
+            setRedirectIn(REDIRECT_DELAY_S);
+            const start = Date.now();
+            redirectTid.current = window.setInterval(() => {
+                const left = REDIRECT_DELAY_S - Math.floor((Date.now() - start) / 1000);
+                if (left <= 0) { window.clearInterval(redirectTid.current!); navigate("/", { replace: true }); }
+                else setRedirectIn(left);
+            }, 250);
         } catch (e: any) {
             setError(e.message || "現在のエピソード設定に失敗しました。");
         } finally {
@@ -109,12 +153,15 @@ export default function ShowsPage() {
                         <button
                             key={s.id}
                             className={`show-card ${selectedId === s.id ? "selected" : ""}`}
-                            onClick={() => setSelectedId(s.id)}
+                            onClick={() => {
+                                setSelectedId(s.id);
+                                setStartTime(s.start_time.slice(0, 5));
+                            }}
                         >
                             <div className="title">第{s.ep_num}話：{s.ep_title}</div>
                             <div className="season subtle">{s.season_name}</div>
                             <div className="meta subtle">
-                                開始 {s.start_time.slice(0,5)}・長さ {s.playback_length.slice(0,5)}
+                                開始 {s.start_time.slice(0, 5)}・長さ {formatPlaybackLen(s.playback_length)}
                             </div>
                         </button>
                     ))}
@@ -139,11 +186,12 @@ export default function ShowsPage() {
                     disabled={
                         posting ||
                         !selectedId ||
+                        isRedirecting ||
                         (!!startTime && !toHHMMSS(startTime))
                     }
                     onClick={submit}
                 >
-                    {posting ? "設定中…" : "現在のエピソードに設定"}
+                    {redirectIn !== null ? `設定しました（${redirectIn}）` : posting ? "設定中…" : "現在のエピソードに設定"}
                 </button>
             </div>