diff --git a/src/clients/useDeprecatedReposts.ts b/src/clients/useDeprecatedReposts.ts
index 4b7e220..e879e98 100644
--- a/src/clients/useDeprecatedReposts.ts
+++ b/src/clients/useDeprecatedReposts.ts
@@ -18,6 +18,7 @@ export type UseDeprecatedReposts = {
 };
 
 const { exec } = useBatchedEvents<UseDeprecatedRepostsProps>(() => ({
+  interval: 3400,
   generateKey: ({ eventId }) => eventId,
   mergeFilters: (args) => {
     const eventIds = args.map((arg) => arg.eventId);
diff --git a/src/clients/useFollowings.ts b/src/clients/useFollowings.ts
index e16cd91..9d70e11 100644
--- a/src/clients/useFollowings.ts
+++ b/src/clients/useFollowings.ts
@@ -52,7 +52,11 @@ const useFollowings = (propsProvider: () => UseFollowingsProps) => {
     return result;
   };
 
-  return { followings };
+  const followingPubkeys = (): string[] => {
+    return followings().map((follow) => follow.pubkey);
+  };
+
+  return { followings, followingPubkeys };
 };
 
 export default useFollowings;
diff --git a/src/components/NotePostForm.tsx b/src/components/NotePostForm.tsx
index 51654fa..e7ac581 100644
--- a/src/components/NotePostForm.tsx
+++ b/src/components/NotePostForm.tsx
@@ -1,11 +1,14 @@
-import { createSignal, createMemo, type Component, type JSX } from 'solid-js';
+import { createSignal, createMemo, onMount, type Component, type JSX } from 'solid-js';
 import PaperAirplane from 'heroicons/24/solid/paper-airplane.svg';
 
 type NotePostFormProps = {
   onPost: (textNote: { content: string }) => void;
+  onClose: () => void;
 };
 
 const NotePostForm: Component<NotePostFormProps> = (props) => {
+  let textAreaRef: HTMLTextAreaElement | undefined;
+
   const [text, setText] = createSignal<string>('');
 
   const clearText = () => setText('');
@@ -28,15 +31,24 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
   const handleKeyDown: JSX.EventHandlerUnion<HTMLTextAreaElement, KeyboardEvent> = (ev) => {
     if (ev.key === 'Enter' && (ev.ctrlKey || ev.metaKey)) {
       submit();
+    } else if (ev.key === 'Escape') {
+      props.onClose();
     }
   };
 
   const submitDisabled = createMemo(() => text().trim().length === 0);
 
+  onMount(() => {
+    if (textAreaRef != null) {
+      textAreaRef.focus();
+    }
+  });
+
   return (
     <div class="p-1">
       <form class="flex flex-col gap-1" onSubmit={handleSubmit}>
         <textarea
+          ref={textAreaRef}
           name="text"
           class="rounded border-none"
           rows={4}
diff --git a/src/components/SideBar.tsx b/src/components/SideBar.tsx
index fdec820..1bc4a8e 100644
--- a/src/components/SideBar.tsx
+++ b/src/components/SideBar.tsx
@@ -1,15 +1,44 @@
-import { createSignal, Show } from 'solid-js';
-import type { Component } from 'solid-js';
+import { createSignal, Show, type JSX, Component } from 'solid-js';
 import MagnifyingGlass from 'heroicons/24/solid/magnifying-glass.svg';
 import PencilSquare from 'heroicons/24/solid/pencil-square.svg';
 
-type SideBarProps = {
-  postForm: () => JSX.Element;
-};
+import NotePostForm from '@/components/NotePostForm';
+
+import useConfig from '@/clients/useConfig';
+import useCommands from '@/clients/useCommands';
+import usePubkey from '@/clients/usePubkey';
+
+import { useHandleCommand } from '@/hooks/useCommandBus';
+
+const SideBar: Component = (props) => {
+  const [config] = useConfig();
+  const pubkey = usePubkey();
+  const commands = useCommands();
 
-const SideBar: Component<SideBarProps> = (props) => {
   const [formOpened, setFormOpened] = createSignal(false);
 
+  const handlePost = ({ content }: { content: string }) => {
+    commands
+      .publishTextNote({
+        relayUrls: config().relayUrls,
+        pubkey: pubkey(),
+        content,
+      })
+      .then(() => {
+        console.log('ok');
+      })
+      .catch((err) => {
+        console.error('error', err);
+      });
+  };
+
+  useHandleCommand(() => ({
+    commandType: 'openPostForm',
+    handler: (cmd) => {
+      setFormOpened(true);
+    },
+  }));
+
   return (
     <div class="flex shrink-0 flex-row border-r bg-sidebar-bg">
       <div class="flex w-14 flex-auto flex-col items-center gap-3 border-r border-rose-200 py-5">
@@ -25,7 +54,9 @@ const SideBar: Component<SideBarProps> = (props) => {
         {/* <div>column 1</div> */}
         {/* <div>column 2</div> */}
       </div>
-      <Show when={formOpened()}>{() => props.postForm()}</Show>
+      <Show when={formOpened()}>
+        <NotePostForm onPost={handlePost} onClose={() => setFormOpened(false)} />
+      </Show>
     </div>
   );
 };
diff --git a/src/components/textNote/ImageDisplay.tsx b/src/components/textNote/ImageDisplay.tsx
index e52ebeb..ec08432 100644
--- a/src/components/textNote/ImageDisplay.tsx
+++ b/src/components/textNote/ImageDisplay.tsx
@@ -25,7 +25,7 @@ const ImageDisplay: Component<ImageDisplayProps> = (props) => {
   return (
     <a href={props.url} target="_blank" rel="noopener noreferrer">
       <img
-        class="max-h-full max-w-full rounded object-contain shadow"
+        class="inline-block max-h-64 max-w-full rounded object-contain shadow"
         src={fixUrl(url())}
         alt={props.url}
       />
diff --git a/src/hooks/useCommandBus.ts b/src/hooks/useCommandBus.ts
new file mode 100644
index 0000000..5047d6c
--- /dev/null
+++ b/src/hooks/useCommandBus.ts
@@ -0,0 +1,54 @@
+import { onMount } from 'solid-js';
+import { useRequestMessage, useHandleMessage } from '@/hooks/useMessageBus';
+
+type UseHandleCommandProps = {
+  commandType: string;
+  handler: (command: Command) => void;
+};
+
+type CommandBase<T> = { command: T };
+
+export type OpenPostForm = CommandBase<'openPostForm'>;
+export type ClosePostForm = CommandBase<'closePostForm'>;
+export type MoveToNextItem = CommandBase<'moveToNextItem'>;
+export type MoveToPrevItem = CommandBase<'moveToPrevItem'>;
+export type MoveToPrevColumn = CommandBase<'moveToPrevColumn'>;
+export type MoveToNextColumn = CommandBase<'moveToNextColumn'>;
+export type MoveToColumn = CommandBase<'moveToNextColumn'> & { columnIndex: number };
+export type Like = CommandBase<'like'>;
+export type Repost = CommandBase<'repost'>;
+export type OpenReplyForm = CommandBase<'openReplyForm'>;
+export type OpenHelp = CommandBase<'openHelp'>;
+export type OpenItemDetail = CommandBase<'openItemDetail'>;
+export type CloseItemDetail = CommandBase<'closeItemDetail'>;
+
+export type Command =
+  | OpenPostForm
+  | ClosePostForm
+  | MoveToNextItem
+  | MoveToPrevItem
+  | MoveToPrevColumn
+  | MoveToNextColumn
+  | Like
+  | Repost
+  | OpenReplyForm
+  | OpenHelp
+  | OpenItemDetail
+  | CloseItemDetail;
+
+export type CommandType = Command['command'];
+
+export const useRequestCommand = () =>
+  useRequestMessage<Command, void>(() => ({ id: 'CommandChannel' }));
+
+export const useHandleCommand = (propsProvider: () => UseHandleCommandProps) => {
+  useHandleMessage<Command, void>(() => ({
+    id: 'CommandChannel',
+    handler: (command) => {
+      const { commandType, handler } = propsProvider();
+      if (command.command === commandType) {
+        handler(command);
+      }
+    },
+  }));
+};
diff --git a/src/hooks/useMessageBus.ts b/src/hooks/useMessageBus.ts
index 793d4d7..8bb6ceb 100644
--- a/src/hooks/useMessageBus.ts
+++ b/src/hooks/useMessageBus.ts
@@ -1,11 +1,12 @@
-import { createSignal, onMount, type Signal } from 'solid-js';
+import { createSignal, createMemo, onMount, type Signal, onCleanup } from 'solid-js';
 
-const [channels, setChannels]: Signal<Record<string, MessageChannel>> = createSignal({});
+export type UseRequestMessageProps = {
+  id: string;
+};
 
-export const CommandChannel = 'CommandChannel' as const;
-
-export type UseMessageChannelProps = {
-  id: typeof CommandChannel;
+export type UseHandleMessageProps<Req, Res> = {
+  id: string;
+  handler: (req: Req) => Res | Promise<Res>;
 };
 
 export type MessageChannelRequest<T> = {
@@ -15,39 +16,28 @@ export type MessageChannelRequest<T> = {
 
 export type MessageChannelResponse<T> = {
   requestId: string;
-  response: T;
+  response?: T;
+  error?: any;
+};
+
+const [channels, setChannels]: Signal<Record<string, MessageChannel>> = createSignal({});
+
+const registerChannelIfNotExist = (id: string) => {
+  if (channels()[id] == null) {
+    setChannels((currentChannels) => ({
+      ...currentChannels,
+      [id]: new MessageChannel(),
+    }));
+  }
 };
 
 // https://developer.mozilla.org/ja/docs/Web/API/Web_Workers_API/Structured_clone_algorithm
-type Clonable =
-  | number
-  | string
-  | boolean
-  | null
-  | bigint
-  | Date
-  | Array<Clonable>
-  | Record<string, Clonable>;
-
-const useMessageBus = <Req extends Clonable, Res extends Clonable>(
-  propsProvider: () => UseMessageChannelProps,
-) => {
-  onMount(() => {
-    const { id } = propsProvider();
-    if (channel() == null) {
-      setChannels((currentChannels) => ({
-        ...currentChannels,
-        [id]: new MessageChannel(),
-      }));
-    }
-  });
-
+export const useRequestMessage = <Req, Res>(propsProvider: () => UseRequestMessageProps) => {
   const channel = () => channels()[propsProvider().id];
 
   const sendRequest = (requestId: string, message: Req) => {
     const request: MessageChannelRequest<Req> = { requestId, request: message };
-    const messageStr = JSON.stringify(request);
-    channel().port1.postMessage(messageStr);
+    channel().port1.postMessage(request);
   };
 
   const waitResponse = (requestId: string, timeoutMs = 1000): Promise<Res> =>
@@ -58,7 +48,11 @@ const useMessageBus = <Req extends Clonable, Res extends Clonable>(
         if (data.requestId !== requestId) return;
 
         channel().port1.removeEventListener('message', listener);
-        resolve(data.response);
+        if (data.response != null) {
+          resolve(data.response);
+        } else {
+          reject(data.error);
+        }
       };
 
       setTimeout(() => {
@@ -70,22 +64,48 @@ const useMessageBus = <Req extends Clonable, Res extends Clonable>(
       channel().port1.start();
     });
 
-  const sendResponse = (res: Res) => {};
+  onMount(() => {
+    const { id } = propsProvider();
+    registerChannelIfNotExist(id);
+  });
 
-  return {
-    async requst(message: Req): Promise<Res> {
-      const requestId = Math.random().toString();
-      const response = waitResponse(requestId);
-      sendRequest(requestId, message);
-      return response;
-    },
-    handle(handler: (message: Req) => Res | Promise<Res>) {
-      channel().port2.addEventListener('message', (ev) => {
-        const request = event.data as MessageChannelRequest<Req>;
-        const res = handler(request.request).then((res) => {});
-      });
-    },
+  return async (message: Req): Promise<Res> => {
+    const requestId = Math.random().toString();
+    const response = waitResponse(requestId);
+    sendRequest(requestId, message);
+    return response;
   };
 };
 
-export default useMessageBus;
+export const useHandleMessage = <Req, Res>(
+  propsProvider: () => UseHandleMessageProps<Req, Res>,
+) => {
+  const props = createMemo(propsProvider);
+  const channel = () => channels()[props().id];
+
+  onMount(() => {
+    const port = channel().port2;
+    const messageHandler = (event: MessageEvent) => {
+      const { requestId, request } = event.data as MessageChannelRequest<Req>;
+      const result = props().handler(request);
+      const resultPromise = result instanceof Promise ? result : Promise.resolve(result);
+
+      resultPromise
+        .then((res) => {
+          const response: MessageChannelResponse<Res> = { requestId, response: res };
+          port.postMessage(response);
+        })
+        .catch((err) => {
+          // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+          const response: MessageChannelResponse<Res> = { requestId, error: err };
+          port.postMessage(response);
+        });
+    };
+    port.addEventListener('message', messageHandler);
+    port.start();
+
+    onCleanup(() => {
+      port.removeEventListener('message', messageHandler);
+    });
+  });
+};
diff --git a/src/hooks/useShortcutKeys.ts b/src/hooks/useShortcutKeys.ts
index 191ebcc..d9757d9 100644
--- a/src/hooks/useShortcutKeys.ts
+++ b/src/hooks/useShortcutKeys.ts
@@ -3,24 +3,26 @@
 
 import { onMount, onCleanup, type JSX } from 'solid-js';
 
-type Shortcut = { key: string; command: string };
+import { useRequestCommand, type Command } from '@/hooks/useCommandBus';
+
+type Shortcut = { key: string; command: Command };
 
 const defaultShortcut: Shortcut[] = [
-  { key: 'n', command: 'openPostForm' },
-  { key: 'h', command: 'moveToPrevColumn' },
-  { key: 'j', command: 'moveToNextItem' },
-  { key: 'k', command: 'moveToPrevItem' },
-  { key: 'l', command: 'moveToNextColumn' },
-  { key: 'ArrowLeft', command: 'moveToPrevColumn' },
-  { key: 'ArrowDown', command: 'moveToNextItem' },
-  { key: 'ArrowUp', command: 'moveToPrevItem' },
-  { key: 'ArrowRight', command: 'moveToNextColumn' },
-  { key: 'f', command: 'like' },
-  { key: 't', command: 'repost' },
-  { key: 'r', command: 'openReplyForm' },
-  { key: '?', command: 'openHelp' },
-  { key: 'Enter', command: 'openItemDetail' },
-  { key: 'Backspace', command: 'closeItemDetail' },
+  { key: 'n', command: { command: 'openPostForm' } },
+  { key: 'h', command: { command: 'moveToPrevColumn' } },
+  { key: 'j', command: { command: 'moveToNextItem' } },
+  { key: 'k', command: { command: 'moveToPrevItem' } },
+  { key: 'l', command: { command: 'moveToNextColumn' } },
+  { key: 'ArrowLeft', command: { command: 'moveToPrevColumn' } },
+  { key: 'ArrowDown', command: { command: 'moveToNextItem' } },
+  { key: 'ArrowUp', command: { command: 'moveToPrevItem' } },
+  { key: 'ArrowRight', command: { command: 'moveToNextColumn' } },
+  { key: 'f', command: { command: 'like' } },
+  { key: 't', command: { command: 'repost' } },
+  { key: 'r', command: { command: 'openReplyForm' } },
+  { key: '?', command: { command: 'openHelp' } },
+  { key: 'Enter', command: { command: 'openItemDetail' } },
+  { key: 'Backspace', command: { command: 'closeItemDetail' } },
 ];
 
 type UseShortcutKeysProps = {
@@ -40,7 +42,7 @@ const useShortcutKeys = ({ shortcuts = defaultShortcut, onShortcut }: UseShortcu
   const shortcutsMap = createShortcutsMap(shortcuts);
 
   onMount(() => {
-    const handleKeydown: JSX.EventHandler<Window, KeyboardEvent> = (ev) => {
+    const handleKeydown = (ev: KeyboardEvent) => {
       if (ev.type !== 'keydown') return;
       if (ev.target instanceof HTMLTextAreaElement || ev.target instanceof HTMLInputElement) return;
 
@@ -59,4 +61,14 @@ const useShortcutKeys = ({ shortcuts = defaultShortcut, onShortcut }: UseShortcu
   });
 };
 
+export const useMountShortcutKeys = () => {
+  const request = useRequestCommand();
+
+  useShortcutKeys({
+    onShortcut: (shortcut) => {
+      request(shortcut.command);
+    },
+  });
+};
+
 export default useShortcutKeys;
diff --git a/src/pages/Home.tsx b/src/pages/Home.tsx
index 443f146..adb1427 100644
--- a/src/pages/Home.tsx
+++ b/src/pages/Home.tsx
@@ -2,23 +2,21 @@ import { Show, For, createSignal, createEffect, onMount, type Component } from '
 import { useNavigate } from '@solidjs/router';
 
 import Column from '@/components/Column';
-import NotePostForm from '@/components/NotePostForm';
 import SideBar from '@/components/SideBar';
 import Timeline from '@/components/Timeline';
 import Notification from '@/components/Notification';
+
 import usePool from '@/clients/usePool';
-import useCommands from '@/clients/useCommands';
 import useConfig from '@/clients/useConfig';
 import useSubscription from '@/clients/useSubscription';
 import useFollowings from '@/clients/useFollowings';
 import usePubkey from '@/clients/usePubkey';
-import useShortcutKeys from '@/hooks/useShortcutKeys';
-import useLoginStatus from '@/hooks/useLoginStatus';
-import ensureNonNull from '@/hooks/ensureNonNull';
 
-useShortcutKeys({
-  onShortcut: (s) => console.log(s),
-});
+import { useMountShortcutKeys } from '@/hooks/useShortcutKeys';
+import useLoginStatus from '@/hooks/useLoginStatus';
+// import ensureNonNull from '@/hooks/ensureNonNull';
+
+useMountShortcutKeys();
 
 const Home: Component = () => {
   const navigate = useNavigate();
@@ -27,7 +25,6 @@ const Home: Component = () => {
   const pool = usePool();
   const [config] = useConfig();
   const pubkey = usePubkey();
-  const commands = useCommands();
 
   createEffect(() => {
     config().relayUrls.map(async (relayUrl) => {
@@ -38,7 +35,7 @@ const Home: Component = () => {
     });
   });
 
-  const { followings } = useFollowings(() => ({
+  const { followingPubkeys } = useFollowings(() => ({
     relayUrls: config().relayUrls,
     pubkey: pubkey(),
   }));
@@ -48,7 +45,7 @@ const Home: Component = () => {
     filters: [
       {
         kinds: [1, 6],
-        authors: [...followings()?.map((f) => f.pubkey), pubkey()] ?? [pubkey()],
+        authors: [...followingPubkeys(), pubkey()],
         limit: 25,
         since: Math.floor(Date.now() / 1000) - 12 * 60 * 60,
       },
@@ -107,31 +104,15 @@ const Home: Component = () => {
   }));
    */
 
-  const handlePost = ({ content }: { content: string }) => {
-    commands
-      .publishTextNote({
-        relayUrls: config().relayUrls,
-        pubkey: pubkey(),
-        content,
-      })
-      .then(() => {
-        console.log('ok');
-      })
-      .catch((err) => {
-        console.error('error', err);
-      });
-  };
-
   onMount(() => {
     if (!loginStatus().loggedIn) {
       navigate('/hello');
     }
   });
 
-  const japaneseRegex = /[あ-ん]/;
   return (
     <div class="flex h-screen w-screen flex-row overflow-hidden">
-      <SideBar postForm={() => <NotePostForm onPost={handlePost} />} />
+      <SideBar />
       <div class="flex flex-row overflow-y-hidden overflow-x-scroll">
         <Column name="ホーム" width="widest">
           <Timeline events={followingsPosts()} />