diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# プーズーさん
+
+Discord Bot
+
+## ライセンス
+
+WTFPL
diff --git a/deno.json b/deno.json
new file mode 100644
index 0000000..c0acb85
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,9 @@
+{
+  "imports": {
+    "@discordjs/rest": "npm:@discordjs/rest@^2.3.0",
+    "discord-api-types": "npm:discord-api-types@^0.37.93",
+    "discord-interactions": "npm:discord-interactions@^4.0.0",
+    "groq-sdk": "npm:groq-sdk@^0.5.0",
+    "hono": "npm:hono@^4.5.2"
+  }
+}
diff --git a/main.ts b/main.ts
new file mode 100644
index 0000000..ea58a32
--- /dev/null
+++ b/main.ts
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: WTFPL
+
+const {
+  /** https://console.groq.com/docs/api-keys */
+  GROQ_API_KEY,
+  /**
+   * 設定方法
+   * 1. Discord アプリを作成 https://discord.com/developers/applications
+   * 2. Public Key をコピー
+   * 3. Bot トークンを生成 (Bot > Build-A-Bot > Rest Token > Copy)
+   *
+   * デプロイ後
+   * 4. Interactions Endpoint URL に https://pudusan.deno.dev を指定
+   * 5. Install Link にアクセス (Installation > Install Link > サーバーに追加)
+   */
+  DISCORD_PUBLIC_KEY,
+  DISCORD_TOKEN,
+} = Deno.env.toObject();
+
+const system = `\
+あなたはプーズーさんです。
+「ますです」「のです」など特徴的な話し方をしますです。
+たくさん本を読んでいる賢いシカ科の動物です。
+竹林にいることが多かったので竹を使った遊びをよくしたのです。
+今日も見聞を広めるためよろしくお願いしますのです。`;
+
+const name = "pudusan";
+const latest = 10;
+const model = "llama-3.1-70b-versatile";
+const usage = `\
+https://dash.deno.com/playground/pudusan
+使い方:
+    /${name} <prompt> 回答
+    /${name} /bye     すべてを忘れる
+    /${name} /help    このテキストを表示
+使用する会話: 最新${latest}件
+モデル: ${model}
+システムプロンプト:
+${system}`;
+
+import { REST } from "npm:@discordjs/rest";
+import {
+  APIApplicationCommandInteraction,
+  APIPingInteraction,
+  ApplicationCommandOptionType,
+  InteractionResponseType,
+  InteractionType,
+  RESTPostAPIApplicationCommandsJSONBody,
+  Routes,
+  Utils,
+} from "npm:discord-api-types/v10";
+import { verifyKey } from "npm:discord-interactions";
+import { Groq } from "npm:groq-sdk";
+import { Hono } from "npm:hono";
+
+type Messages = Array<Groq.Chat.ChatCompletionMessageParam>;
+
+const groq = new Groq({
+  apiKey: GROQ_API_KEY,
+  timeout: 10_000,
+});
+const kv = await Deno.openKv();
+const rest = new REST({ version: "10" }).setToken(DISCORD_TOKEN);
+
+async function chat(messages: Messages): Promise<string | null> {
+  const res = await groq.chat.completions.create({
+    model,
+    messages: [{ role: "system", content: system }, ...messages],
+  });
+
+  return res.choices[0].message.content;
+}
+
+async function updateCommands(
+  interaction: APIPingInteraction,
+  commands: Array<RESTPostAPIApplicationCommandsJSONBody>,
+): Promise<void> {
+  await rest.put(Routes.applicationCommands(interaction.application_id), {
+    body: commands,
+  });
+}
+
+const app = new Hono();
+
+app.post("/", async (c) => {
+  const rawBody = await c.req.text();
+  const isValid = await verifyKey(
+    rawBody,
+    c.req.header("x-signature-ed25519")!,
+    c.req.header("x-signature-timestamp")!,
+    DISCORD_PUBLIC_KEY,
+  );
+
+  if (!isValid) {
+    return c.body("Invalid Signature", 401);
+  }
+
+  const interaction: APIPingInteraction | APIApplicationCommandInteraction =
+    await c.req.json();
+
+  switch (interaction.type) {
+    case InteractionType.Ping: {
+      await updateCommands(interaction, [
+        {
+          name,
+          description: "プーズーさんが何でも答えます",
+          options: [
+            {
+              name: "prompt",
+              description: "指示",
+              type: ApplicationCommandOptionType.String,
+            },
+          ],
+        },
+      ]);
+
+      return c.json({
+        type: InteractionResponseType.Pong,
+      });
+    }
+
+    case InteractionType.ApplicationCommand: {
+      const option = Utils.isChatInputApplicationCommandInteraction(interaction)
+        ? interaction.data.options?.[0]
+        : undefined;
+
+      const prompt =
+        option?.type === ApplicationCommandOptionType.String
+          ? option.value.trim()
+          : "/help";
+
+      let reply: string | null = null;
+
+      switch (prompt) {
+        case "/help": {
+          reply = usage;
+          break;
+        }
+        case "/bye": {
+          reply = "すべて忘れましたのです！";
+          await kv.delete(["channel", interaction.channel.id]);
+          break;
+        }
+        default: {
+          const key = ["channel", interaction.channel.id];
+
+          try {
+            const kve = await kv.get<Messages>(key);
+            const messages = kve.value ?? [];
+
+            if (prompt) messages.push({ role: "user", content: prompt });
+
+            reply = await chat(messages.slice(-latest));
+
+            if (!reply) throw new Error("Empty response");
+
+            messages.push({ role: "assistant", content: reply });
+          } catch (error) {
+            reply = `${error} でしたのです！`;
+
+            await kv.delete(key);
+          }
+          break;
+        }
+      }
+
+      return c.json({
+        type: InteractionResponseType.ChannelMessageWithSource,
+        data: {
+          content: `> /${name} ${prompt}
+${reply}`,
+        },
+      });
+    }
+  }
+});
+
+Deno.serve(app.fetch);