diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 969ca1dc..80841633 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -86,7 +86,7 @@ jobs:
       - uses: actions/setup-node@v3
       - uses: oven-sh/setup-bun@v2
       - run: make prepare-deploy-web
-      - run: test `ls web/out | wc -l` != 0
+      - run: test `ls web/.next | wc -l` != 0
 
   deploy-test-server:
     name: Deploy Test (server)
diff --git a/web/api/chat/chat.ts b/web/api/chat/chat.ts
index b18a8e35..63788ea5 100644
--- a/web/api/chat/chat.ts
+++ b/web/api/chat/chat.ts
@@ -83,14 +83,22 @@ export async function sendDM(
   return res.json();
 }
 
-export async function getDM(friendId: UserID): Promise<DMRoom> {
+export async function getDM(friendId: UserID): Promise<
+  DMRoom & {
+    name: string;
+    thumbnail: string;
+  }
+> {
   const res = await credFetch("GET", endpoints.dmWith(friendId));
   if (res.status === 401) throw new ErrUnauthorized();
   if (res.status !== 200)
     throw new Error(
       `getDM() failed: expected status code 200, got ${res.status}`,
     );
-  const json: DMRoom = await res.json();
+  const json: DMRoom & {
+    name: string;
+    thumbnail: string;
+  } = await res.json();
   if (!Array.isArray(json?.messages)) return json;
   for (const m of json.messages) {
     m.createdAt = new Date(m.createdAt);
diff --git a/web/app/chat/[id]/page.tsx b/web/app/chat/[id]/page.tsx
new file mode 100644
index 00000000..1f717305
--- /dev/null
+++ b/web/app/chat/[id]/page.tsx
@@ -0,0 +1,38 @@
+"use client";
+import { useEffect, useState } from "react";
+import * as chat from "~/api/chat/chat";
+import { RoomWindow } from "~/components/chat/RoomWindow";
+
+export default function Page({ params }: { params: { id: string } }) {
+  const id = Number.parseInt(params.id);
+  const [room, setRoom] = useState<
+    | ({
+        id: number;
+        isDM: true;
+        messages: {
+          id: number;
+          creator: number;
+          createdAt: Date;
+          content: string;
+          edited: boolean;
+        }[];
+      } & {
+        name: string;
+        thumbnail: string;
+      })
+    | null
+  >(null);
+  useEffect(() => {
+    (async () => {
+      const room = await chat.getDM(id);
+      setRoom(room);
+    })();
+  }, [id]);
+
+  return (
+    <>
+      <p>idは{id}です。</p>
+      {room ? <RoomWindow friendId={id} room={room} /> : <p>データないよ</p>}
+    </>
+  );
+}
diff --git a/web/app/chat/page.tsx b/web/app/chat/page.tsx
index 66a344ed..ac10655a 100644
--- a/web/app/chat/page.tsx
+++ b/web/app/chat/page.tsx
@@ -1,10 +1,8 @@
 "use client";
 
-import { useSearchParams } from "next/navigation";
 import { Suspense } from "react";
 import { useRoomsOverview } from "~/api/chat/hooks";
 import RoomList from "~/components/chat/RoomList";
-import { RoomWindow } from "~/components/chat/RoomWindow";
 import FullScreenCircularProgress from "~/components/common/FullScreenCircularProgress";
 
 export default function Chat() {
@@ -16,18 +14,8 @@ export default function Chat() {
 }
 
 function ChatListContent() {
-  const searchParams = useSearchParams();
-
-  const friendId = searchParams.get("friendId");
-
   const { state } = useRoomsOverview();
-
-  return friendId ? (
-    <>
-      <p>Chat - friend Id: {friendId}</p>
-      <RoomWindow />
-    </>
-  ) : state.current === "loading" ? (
+  return state.current === "loading" ? (
     <FullScreenCircularProgress />
   ) : state.current === "error" ? (
     <p className="decoration-red">Error: {state.error.message}</p>
diff --git a/web/components/chat/MessageInput.tsx b/web/components/chat/MessageInput.tsx
index 06fbd08a..7d8119a6 100644
--- a/web/components/chat/MessageInput.tsx
+++ b/web/components/chat/MessageInput.tsx
@@ -1,27 +1,27 @@
-import type { DMOverview, SendMessage, UserID } from "common/types";
+import type { SendMessage, UserID } from "common/types";
 import { parseContent } from "common/zod/methods";
 import { useEffect, useState } from "react";
 import { MdSend } from "react-icons/md";
 
 type Props = {
   send: (to: UserID, m: SendMessage) => void;
-  room: DMOverview;
+  friendId: UserID;
 };
 
 const crossRoomMessageState = new Map<number, string>();
 
-export function MessageInput({ send, room }: Props) {
+export function MessageInput({ send, friendId }: Props) {
   const [message, _setMessage] = useState<string>("");
   const [error, setError] = useState<string | null>(null);
 
   function setMessage(m: string) {
     _setMessage(m);
-    crossRoomMessageState.set(room.friendId, m);
+    crossRoomMessageState.set(friendId, m);
   }
 
   useEffect(() => {
-    _setMessage(crossRoomMessageState.get(room.friendId) || "");
-  }, [room.friendId]);
+    _setMessage(crossRoomMessageState.get(friendId) || "");
+  }, [friendId]);
 
   function submit(e: React.FormEvent) {
     e.preventDefault();
@@ -34,7 +34,7 @@ export function MessageInput({ send, room }: Props) {
     }
 
     if (message.trim()) {
-      send(room.friendId, { content: message });
+      send(friendId, { content: message });
       setMessage("");
     }
   }
@@ -50,7 +50,7 @@ export function MessageInput({ send, room }: Props) {
         return;
       }
       if (message.trim()) {
-        send(room.friendId, { content: message });
+        send(friendId, { content: message });
         setMessage("");
       }
     }
diff --git a/web/components/chat/RoomHeader.tsx b/web/components/chat/RoomHeader.tsx
index 17b2b495..bff1fdc2 100644
--- a/web/components/chat/RoomHeader.tsx
+++ b/web/components/chat/RoomHeader.tsx
@@ -1,10 +1,22 @@
-import type { DMOverview } from "common/types";
 import Link from "next/link";
 import { MdArrowBack } from "react-icons/md";
 import UserAvatar from "../human/avatar";
 
 type Props = {
-  room: DMOverview;
+  room: {
+    isDM: true;
+    id: number;
+    messages: {
+      id: number;
+      creator: number;
+      createdAt: Date;
+      content: string;
+      edited: boolean;
+    }[];
+  } & {
+    name: string;
+    thumbnail: string;
+  };
 };
 
 export function RoomHeader(props: Props) {
diff --git a/web/components/chat/RoomList.tsx b/web/components/chat/RoomList.tsx
index 3bc6fea3..1c6b6fad 100644
--- a/web/components/chat/RoomList.tsx
+++ b/web/components/chat/RoomList.tsx
@@ -12,15 +12,8 @@ type RoomListProps = {
 export function RoomList(props: RoomListProps) {
   const { roomsData } = props;
   const router = useRouter();
-
-  /**
-   * FIXME:
-   * React Router が使えなくなったので、一時的に room の情報を URL に載せることで状態管理
-   */
   const navigateToRoom = (room: Extract<RoomOverview, { isDM: true }>) => {
-    router.push(
-      `./?friendId=${room.friendId}&roomData=${encodeURIComponent(JSON.stringify(room))}`,
-    );
+    router.push(`/chat/${room.friendId}`);
   };
 
   return (
diff --git a/web/components/chat/RoomWindow.tsx b/web/components/chat/RoomWindow.tsx
index 23113e97..d8b211ba 100644
--- a/web/components/chat/RoomWindow.tsx
+++ b/web/components/chat/RoomWindow.tsx
@@ -1,12 +1,6 @@
-import type {
-  DMOverview,
-  Message,
-  MessageID,
-  SendMessage,
-  UserID,
-} from "common/types";
+"use client";
+import type { Message, MessageID, SendMessage, UserID } from "common/types";
 import type { Content } from "common/zod/types";
-import { useSearchParams } from "next/navigation";
 import { useSnackbar } from "notistack";
 import { useCallback, useEffect, useRef, useState } from "react";
 import * as chat from "~/api/chat/chat";
@@ -19,13 +13,25 @@ import { socket } from "../data/socket";
 import { MessageInput } from "./MessageInput";
 import { RoomHeader } from "./RoomHeader";
 
-export function RoomWindow() {
-  // FIXME:  React Router が使えなくなったので、一時的に room の情報を URL に載せることで状態管理
-  const searchParams = useSearchParams();
-  const roomData = searchParams.get("roomData");
-  const room = roomData
-    ? (JSON.parse(decodeURIComponent(roomData)) as DMOverview)
-    : null;
+type Props = {
+  friendId: UserID;
+  room: {
+    id: number;
+    messages: {
+      id: number;
+      creator: number;
+      createdAt: Date;
+      content: string;
+      edited: boolean;
+    }[];
+    isDM: true;
+  } & {
+    name: string;
+    thumbnail: string;
+  };
+};
+export function RoomWindow(props: Props) {
+  const { friendId, room } = props;
 
   if (!room) {
     return (
@@ -36,7 +42,7 @@ export function RoomWindow() {
   const {
     state: { data: myId },
   } = useMyID();
-  const { state, reload, write } = useMessages(room.friendId);
+  const { state, reload, write } = useMessages(friendId);
   const [messages, setMessages] = useState(state.data);
 
   useEffect(() => {
@@ -73,7 +79,7 @@ export function RoomWindow() {
       const idToken = await getIdToken();
       socket.emit("register", idToken);
       socket.on("newMessage", async (msg: Message) => {
-        if (msg.creator === room.friendId) {
+        if (msg.creator === friendId) {
           appendLocalMessage(msg);
         } else {
           const creator = await user.get(msg.creator);
@@ -87,7 +93,7 @@ export function RoomWindow() {
         }
       });
       socket.on("updateMessage", async (msg: Message) => {
-        if (msg.creator === room.friendId) {
+        if (msg.creator === friendId) {
           updateLocalMessage(msg);
         }
       });
@@ -104,6 +110,7 @@ export function RoomWindow() {
     };
   }, [
     room,
+    friendId,
     enqueueSnackbar,
     appendLocalMessage,
     updateLocalMessage,
@@ -142,11 +149,11 @@ export function RoomWindow() {
       const editedMessage = await chat.updateMessage(
         message,
         { content },
-        room.friendId,
+        friendId,
       );
       updateLocalMessage(editedMessage);
     },
-    [updateLocalMessage, room.friendId],
+    [updateLocalMessage, friendId],
   );
 
   const cancelEdit = useCallback(() => {
@@ -167,7 +174,7 @@ export function RoomWindow() {
       <div className="fixed top-14 z-50 w-full bg-white">
         <RoomHeader room={room} />
       </div>
-      <div className="absolute top-14 right-0 bottom-14 left-0 flex flex-col overflow-y-auto">
+      <div className="absolute top-14 right-0 left-0 flex flex-col overflow-y-auto">
         {messages && messages.length > 0 ? (
           <div className="flex-grow overflow-y-auto p-2" ref={scrollDiv}>
             {messages.map((m) => (
@@ -225,7 +232,7 @@ export function RoomWindow() {
                           {
                             label: "削除",
                             color: "red",
-                            onClick: () => deleteMessage(m.id, room.friendId),
+                            onClick: () => deleteMessage(m.id, friendId),
                             alert: true,
                             messages: {
                               buttonMessage: "削除",
@@ -248,8 +255,8 @@ export function RoomWindow() {
           </div>
         )}
       </div>
-      <div className="fixed bottom-0 w-full bg-white p-0">
-        <MessageInput send={sendDMMessage} room={room} />
+      <div className="fixed bottom-12 w-full bg-white p-0">
+        <MessageInput send={sendDMMessage} friendId={friendId} />
       </div>
     </>
   );
diff --git a/web/firebase/auth/lib.ts b/web/firebase/auth/lib.ts
index dbeeb190..1cae6c90 100644
--- a/web/firebase/auth/lib.ts
+++ b/web/firebase/auth/lib.ts
@@ -17,7 +17,8 @@ const token = new Promise<string>((resolve) => {
 });
 
 export async function getIdToken(): Promise<IDToken> {
-  return await token;
+  const toke = await token;
+  return toke;
 }
 
 type RequestMethod = "GET" | "POST" | "PUT" | "PATCH" | "DELETE";
diff --git a/web/next.config.mjs b/web/next.config.mjs
index 4350313c..4678774e 100644
--- a/web/next.config.mjs
+++ b/web/next.config.mjs
@@ -1,6 +1,4 @@
 /** @type {import('next').NextConfig} */
-const nextConfig = {
-  output: "export",
-};
+const nextConfig = {};
 
 export default nextConfig;