diff --git a/package-lock.json b/package-lock.json
index 688ee10..2ece450 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
-  "name": "nostiger",
+  "name": "rabbit",
   "version": "0.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "nostiger",
+      "name": "rabbit",
       "version": "0.0.0",
       "license": "AGPL-3.0-or-later",
       "dependencies": {
@@ -16,7 +16,9 @@
         "@tanstack/react-query-persist-client": "^4.24.10",
         "@tanstack/solid-query": "^4.24.10",
         "@thisbeyond/solid-dnd": "^0.7.3",
+        "@types/lodash": "^4.14.191",
         "heroicons": "^2.0.15",
+        "lodash": "^4.17.21",
         "nostr-tools": "^1.3.2",
         "solid-js": "^1.6.9",
         "tailwindcss": "^3.2.4",
@@ -1492,6 +1494,11 @@
       "integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==",
       "dev": true
     },
+    "node_modules/@types/lodash": {
+      "version": "4.14.191",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.191.tgz",
+      "integrity": "sha512-BdZ5BCCvho3EIXw6wUCXHe7rS53AIDPLE+JzwgT+OsJk53oBfbSmZZ7CX4VaRoN78N+TJpFi9QPlfIVNmJYWxQ=="
+    },
     "node_modules/@types/mocha": {
       "version": "10.0.1",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.1.tgz",
@@ -5281,6 +5288,11 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+    },
     "node_modules/lodash.flattendeep": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz",
@@ -9532,6 +9544,11 @@
       "integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==",
       "dev": true
     },
+    "@types/lodash": {
+      "version": "4.14.191",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.191.tgz",
+      "integrity": "sha512-BdZ5BCCvho3EIXw6wUCXHe7rS53AIDPLE+JzwgT+OsJk53oBfbSmZZ7CX4VaRoN78N+TJpFi9QPlfIVNmJYWxQ=="
+    },
     "@types/mocha": {
       "version": "10.0.1",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-10.0.1.tgz",
@@ -12263,6 +12280,11 @@
         "p-locate": "^5.0.0"
       }
     },
+    "lodash": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+    },
     "lodash.flattendeep": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/lodash.flattendeep/-/lodash.flattendeep-4.4.0.tgz",
diff --git a/package.json b/package.json
index 7ca1762..b3782ce 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,9 @@
     "@tanstack/react-query-persist-client": "^4.24.10",
     "@tanstack/solid-query": "^4.24.10",
     "@thisbeyond/solid-dnd": "^0.7.3",
+    "@types/lodash": "^4.14.191",
     "heroicons": "^2.0.15",
+    "lodash": "^4.17.21",
     "nostr-tools": "^1.3.2",
     "solid-js": "^1.6.9",
     "tailwindcss": "^3.2.4",
diff --git a/src/clients/useCommands.ts b/src/clients/useCommands.ts
index fddc9a2..92f873b 100644
--- a/src/clients/useCommands.ts
+++ b/src/clients/useCommands.ts
@@ -46,16 +46,33 @@ const useCommands = () => {
       relayUrls,
       pubkey,
       content,
+      notifyPubkeys,
+      rootEventId,
+      mentionEventIds,
+      replyEventId,
     }: {
       relayUrls: string[];
       pubkey: string;
       content: string;
+      notifyPubkeys?: string[];
+      rootEventId?: string;
+      mentionEventIds?: string[];
+      replyEventId?: string;
     }): Promise<Promise<void>[]> {
+      const pTags = notifyPubkeys?.map((p) => ['p', p]) ?? [];
+      const eTags = [];
+      if (rootEventId != null) eTags.push(['e', rootEventId, '', 'root']);
+      if (mentionEventIds != null)
+        mentionEventIds.forEach((id) => eTags.push(['e', id, '', 'mention']));
+      if (replyEventId != null) eTags.push(['e', replyEventId, '', 'reply']);
+
+      const tags = [...pTags, ...eTags];
+
       const preSignedEvent: NostrEvent = {
         kind: 1,
         pubkey,
         created_at: currentDate(),
-        tags: [],
+        tags,
         content,
       };
       return publishEvent(relayUrls, preSignedEvent);
diff --git a/src/clients/useDeprecatedReposts.ts b/src/clients/useDeprecatedReposts.ts
index d2ffa06..4b81785 100644
--- a/src/clients/useDeprecatedReposts.ts
+++ b/src/clients/useDeprecatedReposts.ts
@@ -31,6 +31,7 @@ const { exec } = useBatchedEvents<UseDeprecatedRepostsProps>(() => ({
 const useDeprecatedReposts = (
   propsProvider: () => UseDeprecatedRepostsProps,
 ): UseDeprecatedReposts => {
+  const queryClient = useQueryClient();
   const props = createMemo(propsProvider);
   const queryKey = createMemo(() => ['useDeprecatedReposts', props()] as const);
 
@@ -55,10 +56,8 @@ const useDeprecatedReposts = (
   const isRepostedBy = (pubkey: string): boolean =>
     reposts().findIndex((event) => event.pubkey === pubkey) !== -1;
 
-  const invalidateDeprecatedReposts = (): Promise<void> => {
-    const queryClient = useQueryClient();
-    return queryClient.invalidateQueries(queryKey());
-  };
+  const invalidateDeprecatedReposts = (): Promise<void> =>
+    queryClient.invalidateQueries(queryKey());
 
   return { reposts, isRepostedBy, invalidateDeprecatedReposts, query };
 };
diff --git a/src/clients/useReactions.ts b/src/clients/useReactions.ts
index f5a1965..87ab369 100644
--- a/src/clients/useReactions.ts
+++ b/src/clients/useReactions.ts
@@ -30,6 +30,7 @@ const { exec } = useBatchedEvents<UseReactionsProps>(() => ({
 }));
 
 const useReactions = (propsProvider: () => UseReactionsProps): UseReactions => {
+  const queryClient = useQueryClient();
   const props = createMemo(propsProvider);
   const queryKey = createMemo(() => ['useReactions', props()] as const);
 
@@ -61,10 +62,7 @@ const useReactions = (propsProvider: () => UseReactionsProps): UseReactions => {
   const isReactedBy = (pubkey: string): boolean =>
     reactions().findIndex((event) => event.pubkey === pubkey) !== -1;
 
-  const invalidateReactions = (): Promise<void> => {
-    const queryClient = useQueryClient();
-    return queryClient.invalidateQueries(queryKey());
-  };
+  const invalidateReactions = (): Promise<void> => queryClient.invalidateQueries(queryKey());
 
   return { reactions, reactionsGroupedByContent, isReactedBy, invalidateReactions, query };
 };
diff --git a/src/components/ColumnItem.tsx b/src/components/ColumnItem.tsx
index 16f0a24..8a60bdd 100644
--- a/src/components/ColumnItem.tsx
+++ b/src/components/ColumnItem.tsx
@@ -5,9 +5,7 @@ type ColumnItemProps = {
 };
 
 const ColumnItem: Component<ColumnItemProps> = (props) => {
-  return (
-    <div class="flex w-full flex-row gap-1 overflow-hidden border-b p-1">{props.children}</div>
-  );
+  return <div class="overflow-hidden border-b p-1">{props.children}</div>;
 };
 
 export default ColumnItem;
diff --git a/src/components/DeprecatedRepost.tsx b/src/components/DeprecatedRepost.tsx
index c69d9c2..964e3cd 100644
--- a/src/components/DeprecatedRepost.tsx
+++ b/src/components/DeprecatedRepost.tsx
@@ -7,7 +7,7 @@ import useConfig from '@/clients/useConfig';
 import useEvent from '@/clients/useEvent';
 import useProfile from '@/clients/useProfile';
 
-import UserNameDisplay from '@/components/UserNameDisplay';
+import UserDisplayName from '@/components/UserDisplayName';
 import TextNote from '@/components/TextNote';
 
 export type DeprecatedRepostProps = {
@@ -32,7 +32,7 @@ const DeprecatedRepost: Component<DeprecatedRepostProps> = (props) => {
           <ArrowPathRoundedSquare />
         </div>
         <div class="truncate break-all">
-          <UserNameDisplay pubkey={props.event.pubkey} />
+          <UserDisplayName pubkey={props.event.pubkey} />
           {' Reposted'}
         </div>
       </div>
diff --git a/src/components/NotePostForm.tsx b/src/components/NotePostForm.tsx
index 64d7a5d..1b7051e 100644
--- a/src/components/NotePostForm.tsx
+++ b/src/components/NotePostForm.tsx
@@ -25,7 +25,7 @@ const NotePostForm: Component<NotePostFormProps> = (props) => {
 
   return (
     <div class="p-1">
-      <form class="grid w-64 gap-1" onSubmit={handleSubmit}>
+      <form class="flex flex-col gap-1" onSubmit={handleSubmit}>
         <textarea
           name="text"
           class="rounded border-none"
diff --git a/src/components/ReplyPostForm.tsx b/src/components/ReplyPostForm.tsx
index 1443f05..ecbc674 100644
--- a/src/components/ReplyPostForm.tsx
+++ b/src/components/ReplyPostForm.tsx
@@ -1,6 +1,62 @@
-import { type Component } from 'solid-js';
+import { createSignal, createMemo, type Component, type JSX } from 'solid-js';
+import type { Event as NostrEvent } from 'nostr-tools/event';
 
-const ReplyPostForm = () => {
+import PaperAirplane from 'heroicons/24/solid/paper-airplane.svg';
+
+type ReplyPostFormProps = {
+  replyTo: NostrEvent;
+  onPost: (textNote: { content: string }) => void;
+  onClose: () => void;
+};
+
+const ReplyPostForm: Component<ReplyPostFormProps> = (props: ReplyPostFormProps) => {
+  const [text, setText] = createSignal<string>('');
+
+  const clearText = () => setText('');
+
+  const handleChangeText: JSX.EventHandler<HTMLTextAreaElement, Event> = (ev) => {
+    setText(ev.currentTarget.value);
+  };
+
+  const handleSubmit: JSX.EventHandler<HTMLFormElement, Event> = (ev) => {
+    ev.preventDefault();
+    // TODO 投稿完了したかどうかの検知をしたい
+    props.onPost({ content: text() });
+    clearText();
+  };
+
+  const submitDisabled = createMemo(() => text().trim().length === 0);
+
+  return (
+    <div class="p-1">
+      <div>
+        {'Replying to '}
+        {props.replyTo.pubkey}
+      </div>
+      <form class="grid w-full gap-1" onSubmit={handleSubmit}>
+        <textarea
+          name="text"
+          class="rounded border-none"
+          rows={4}
+          placeholder="返信を投稿"
+          onInput={handleChangeText}
+          value={text()}
+        />
+        <div class="flex justify-between">
+          {/* TODO あとでちゃんとアイコンにする */}
+          <button onClick={() => props.onClose()}>X</button>
+          <button
+            class="h-7 w-7 rounded bg-primary p-2 font-bold text-white"
+            classList={{ 'bg-primary-disabled': submitDisabled(), 'bg-primary': !submitDisabled() }}
+            type="submit"
+            disabled={submitDisabled()}
+          >
+            <PaperAirplane />
+          </button>
+        </div>
+      </form>
+    </div>
+  );
 };
 
 export default ReplyPostForm;
diff --git a/src/components/SideBar.tsx b/src/components/SideBar.tsx
index f74d3e2..fdec820 100644
--- a/src/components/SideBar.tsx
+++ b/src/components/SideBar.tsx
@@ -12,7 +12,7 @@ const SideBar: Component<SideBarProps> = (props) => {
 
   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 py-5">
+      <div class="flex w-14 flex-auto flex-col items-center gap-3 border-r border-rose-200 py-5">
         <button
           class={`h-9 w-9 rounded-full border border-primary bg-primary p-2 text-2xl font-bold text-white`}
           onClick={() => setFormOpened((current) => !current)}
diff --git a/src/components/TextNote.tsx b/src/components/TextNote.tsx
index b73f27e..db32ef5 100644
--- a/src/components/TextNote.tsx
+++ b/src/components/TextNote.tsx
@@ -1,5 +1,6 @@
-import { Show, For, createMemo, type JSX, type Component } from 'solid-js';
+import { Show, For, createSignal, createMemo, type JSX, type Component } from 'solid-js';
 import type { Event as NostrEvent } from 'nostr-tools/event';
+import uniq from 'lodash/uniq';
 
 import HeartOutlined from 'heroicons/24/outline/heart.svg';
 import HeartSolid from 'heroicons/24/solid/heart.svg';
@@ -18,6 +19,7 @@ import { formatRelative } from '@/utils/formatDate';
 import ColumnItem from '@/components/ColumnItem';
 import GeneralUserMentionDisplay from '@/components/textNote/GeneralUserMentionDisplay';
 import TextNoteContentDisplay from '@/components/textNote/TextNoteContentDisplay';
+import ReplyPostForm from '@/components/ReplyPostForm';
 
 export type TextNoteProps = {
   event: NostrEvent;
@@ -28,6 +30,7 @@ const TextNote: Component<TextNoteProps> = (props) => {
   const [config] = useConfig();
   const commands = useCommands();
   const pubkey = usePubkey();
+  const [showReplyForm, setShowReplyForm] = createSignal(false);
 
   const { profile: author } = useProfile(() => ({
     relayUrls: config().relayUrls,
@@ -48,11 +51,24 @@ const TextNote: Component<TextNoteProps> = (props) => {
   const isRepostedByMe = createMemo(() => isRepostedBy(pubkey()));
 
   const replyingToPubKeys = createMemo(() =>
-    props.event.tags.filter((tag) => tag[0] === 'p').map((e) => e[1]),
+    uniq(props.event.tags.filter((tag) => tag[0] === 'p').map((e) => e[1])),
   );
-  // TODO 日付をいい感じにフォーマットする関数を作る
   const createdAt = () => formatRelative(new Date(props.event.created_at * 1000), currentDate());
 
+  const handleReplyPost = ({ content }: { content: string }) => {
+    commands
+      .publishTextNote({
+        relayUrls: config().relayUrls,
+        pubkey: pubkey(),
+        content,
+        notifyPubkeys: [props.event.pubkey, ...replyingToPubKeys()],
+        replyEventId: props.event.id,
+      })
+      .then(() => {
+        setShowReplyForm(false);
+      });
+  };
+
   const handleRepost: JSX.EventHandler<HTMLButtonElement, MouseEvent> = (ev) => {
     ev.preventDefault();
 
@@ -87,85 +103,99 @@ const TextNote: Component<TextNoteProps> = (props) => {
   return (
     <div class="textnote">
       <ColumnItem>
-        <div class="author-icon h-10 w-10 shrink-0">
-          <Show when={author()?.picture}>
-            {/* TODO 画像は脆弱性回避のためにimgじゃない方法で読み込みたい */}
-            <img
-              src={author()?.picture}
-              alt="icon"
-              // TODO autofit
-              class="h-10 w-10 rounded"
-            />
-          </Show>
-        </div>
-        <div class="min-w-0 flex-auto">
-          <div class="flex justify-between gap-1 text-xs">
-            <div class="author flex min-w-0 truncate">
-              {/* TODO link to author */}
-              <Show when={(author()?.display_name?.length ?? 0) > 0}>
-                <div class="author-name truncate pr-1 font-bold">{author()?.display_name}</div>
+        <div class="flex flex-col">
+          <div class="flex w-full gap-1">
+            <div class="author-icon h-10 w-10 shrink-0">
+              <Show when={author()?.picture}>
+                {/* TODO 画像は脆弱性回避のためにimgじゃない方法で読み込みたい */}
+                <img
+                  src={author()?.picture}
+                  alt="icon"
+                  // TODO autofit
+                  class="h-10 w-10 rounded"
+                />
               </Show>
-              <div class="author-username truncate text-zinc-600">
-                <Show when={author()?.name} fallback={props.event.pubkey}>
-                  @{author()?.name}
-                </Show>
+            </div>
+            <div class="min-w-0 flex-auto">
+              <div class="flex justify-between gap-1 text-xs">
+                <div class="author flex min-w-0 truncate">
+                  {/* TODO link to author */}
+                  <Show when={(author()?.display_name?.length ?? 0) > 0}>
+                    <div class="author-name truncate pr-1 font-bold">{author()?.display_name}</div>
+                  </Show>
+                  <div class="author-username truncate text-zinc-600">
+                    <Show when={author()?.name} fallback={props.event.pubkey}>
+                      @{author()?.name}
+                    </Show>
+                  </div>
+                </div>
+                <div class="created-at shrink-0">{createdAt()}</div>
+              </div>
+              <Show when={replyingToPubKeys().length > 0}>
+                <div class="text-xs">
+                  {'Replying to '}
+                  <For each={replyingToPubKeys()}>
+                    {(replyToPubkey: string) => (
+                      <span class="pr-1 text-blue-500 underline">
+                        <GeneralUserMentionDisplay pubkey={replyToPubkey} />
+                      </span>
+                    )}
+                  </For>
+                </div>
+              </Show>
+              <div class="content whitespace-pre-wrap break-all">
+                <TextNoteContentDisplay event={props.event} embedding={true} />
+              </div>
+              <div class="flex w-48 items-center justify-between gap-8 pt-1">
+                <button
+                  class="h-4 w-4 text-zinc-400"
+                  onClick={() => setShowReplyForm((current) => !current)}
+                >
+                  <ChatBubbleLeft />
+                </button>
+                <div
+                  class="flex items-center gap-1"
+                  classList={{
+                    'text-zinc-400': !isRepostedByMe(),
+                    'text-green-400': isRepostedByMe(),
+                  }}
+                >
+                  <button class="h-4 w-4" onClick={handleReaction}>
+                    <ArrowPathRoundedSquare />
+                  </button>
+                  <Show when={reposts().length > 0}>
+                    <div class="text-sm text-zinc-400">{reposts().length}</div>
+                  </Show>
+                </div>
+                <div
+                  class="flex items-center gap-1"
+                  classList={{
+                    'text-zinc-400': !isReactedByMe(),
+                    'text-rose-400': isReactedByMe(),
+                  }}
+                >
+                  <button class="h-4 w-4" onClick={handleReaction}>
+                    <Show when={isReactedByMe()} fallback={<HeartOutlined />}>
+                      <HeartSolid />
+                    </Show>
+                  </button>
+                  <Show when={reactions().length > 0}>
+                    <div class="text-sm text-zinc-400">{reactions().length}</div>
+                  </Show>
+                </div>
+                <button class="h-4 w-4 text-zinc-400">
+                  <EllipsisHorizontal />
+                </button>
               </div>
             </div>
-            <div class="created-at shrink-0">{createdAt()}</div>
           </div>
-          <Show when={replyingToPubKeys().length > 0}>
-            <div class="text-xs">
-              {'Replying to '}
-              <For each={replyingToPubKeys()}>
-                {(replyToPubkey: string) => (
-                  <span class="pr-1 text-blue-500 underline">
-                    <GeneralUserMentionDisplay pubkey={replyToPubkey} />
-                  </span>
-                )}
-              </For>
-            </div>
+          <Show when={showReplyForm()}>
+            <ReplyPostForm
+              replyTo={props.event}
+              onPost={handleReplyPost}
+              onClose={() => setShowReplyForm(false)}
+            />
           </Show>
-          <div class="content whitespace-pre-wrap break-all">
-            <TextNoteContentDisplay event={props.event} embedding={true} />
-          </div>
-          <div class="flex w-48 items-center justify-between gap-8 pt-1">
-            <button class="h-4 w-4 text-zinc-400">
-              <ChatBubbleLeft />
-            </button>
-            <div
-              class="flex items-center gap-1"
-              classList={{
-                'text-zinc-400': !isRepostedByMe(),
-                'text-green-400': isRepostedByMe(),
-              }}
-            >
-              <button class="h-4 w-4" onClick={handleReaction}>
-                <ArrowPathRoundedSquare />
-              </button>
-              <Show when={reposts().length > 0}>
-                <div class="text-sm text-zinc-400">{reposts().length}</div>
-              </Show>
-            </div>
-            <div
-              class="flex items-center gap-1"
-              classList={{
-                'text-zinc-400': !isReactedByMe(),
-                'text-rose-400': isReactedByMe(),
-              }}
-            >
-              <button class="h-4 w-4" onClick={handleReaction}>
-                <Show when={isReactedByMe()} fallback={<HeartOutlined />}>
-                  <HeartSolid />
-                </Show>
-              </button>
-              <Show when={reactions().length > 0}>
-                <div class="text-sm text-zinc-400">{reactions().length}</div>
-              </Show>
-            </div>
-            <button class="h-4 w-4 text-zinc-400">
-              <EllipsisHorizontal />
-            </button>
-          </div>
         </div>
       </ColumnItem>
     </div>
diff --git a/src/components/UserNameDisplay.tsx b/src/components/UserDisplayName.tsx
similarity index 100%
rename from src/components/UserNameDisplay.tsx
rename to src/components/UserDisplayName.tsx
diff --git a/src/components/notification/Reaction.tsx b/src/components/notification/Reaction.tsx
index ef338d1..a19a0d6 100644
--- a/src/components/notification/Reaction.tsx
+++ b/src/components/notification/Reaction.tsx
@@ -2,7 +2,7 @@ import { Switch, Match, type Component, Show } from 'solid-js';
 import { type Event as NostrEvent } from 'nostr-tools/event';
 import HeartSolid from 'heroicons/24/solid/heart.svg';
 
-import UserNameDisplay from '@/components/UserNameDisplay';
+import UserDisplayName from '@/components/UserDisplayName';
 import TextNote from '@/components/TextNote';
 
 import useConfig from '@/clients/useConfig';
@@ -54,7 +54,7 @@ const Reaction: Component<ReactionProps> = (props) => {
             </div>
             <div>
               <span class="truncate whitespace-pre-wrap break-all font-bold">
-                <UserNameDisplay pubkey={props.event.pubkey} />
+                <UserDisplayName pubkey={props.event.pubkey} />
               </span>
               {' reacted'}
             </div>