diff --git a/README.ja.md b/README.ja.md
index 982f2ef..77d9dd4 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -2,6 +2,7 @@
 [![macOS](https://github.com/long-910/dotfiles/actions/workflows/macos.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/macos.yml)
 [![ShellCheck](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml)
 [![License](https://img.shields.io/github/license/long-910/dotfiles)](https://github.com/long-910/dotfiles/blob/main/LICENSE)
+[![Sponsor](https://img.shields.io/badge/Sponsor-GitHub-pink?logo=github)](https://github.com/sponsors/long-910)
 
 [English](README.md) | [日本語](README.ja.md) | [中文](README.zh.md)
 
@@ -14,7 +15,27 @@ macOS・Ubuntu・WSL 向け開発環境セットアップスクリプト集で
 
 ## クイックスタート
 
-### bootstrap.sh（推奨）
+### ワンライナーインストール（curl）
+
+1コマンドでクローンしてインタラクティブインストーラーを起動：
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+すべてを非インタラクティブにインストールする場合：
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash -s -- --all
+```
+
+リポジトリは `~/.dotfiles` にクローンされます。`DOTFILES_DIR` で変更可能：
+
+```bash
+DOTFILES_DIR=~/my-dotfiles curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+### bootstrap.sh（git clone）
 
 インタラクティブメニューで機能ブロックを選択してインストール。
 
@@ -83,6 +104,14 @@ bash bootstrap.sh --list                # モジュール一覧表示
 | [jq](https://jqlang.github.io/jq/) | コマンドライン JSON プロセッサ |
 | [lazygit](https://github.com/jesseduffield/lazygit) | git のターミナル UI |
 
+### ターミナルマルチプレクサ
+
+| ツール | 説明 |
+|-------|------|
+| [tmux](https://github.com/tmux/tmux) | ターミナルマルチプレクサ。ログイン時に自動起動し、tmux 終了でシェルも終了 |
+
+新しいターミナルを開くと tmux が自動的に起動し、`main` という名前のセッションにアタッチ（なければ作成）します。tmux を終了するとシェルも終了します。無効にするには `~/.zshrc.d/tmux.zsh` を削除してください。
+
 ### ファイル管理
 
 | ツール | 説明 |
diff --git a/README.md b/README.md
index 9be7937..6dcb2cf 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 [![macOS](https://github.com/long-910/dotfiles/actions/workflows/macos.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/macos.yml)
 [![ShellCheck](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml)
 [![License](https://img.shields.io/github/license/long-910/dotfiles)](https://github.com/long-910/dotfiles/blob/main/LICENSE)
+[![Sponsor](https://img.shields.io/badge/Sponsor-GitHub-pink?logo=github)](https://github.com/sponsors/long-910)
 
 [English](README.md) | [日本語](README.ja.md) | [中文](README.zh.md)
 
@@ -14,7 +15,27 @@ Select and install only the feature blocks you need via an interactive menu.
 
 ## Quick Start
 
-### bootstrap.sh (Recommended)
+### One-line install (curl)
+
+Clone and run the interactive installer in one command:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+To install everything non-interactively:
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash -s -- --all
+```
+
+The repository is cloned to `~/.dotfiles`. Set `DOTFILES_DIR` to override the location:
+
+```bash
+DOTFILES_DIR=~/my-dotfiles curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+### bootstrap.sh (git clone)
 
 Select feature blocks from an interactive menu.
 
@@ -83,6 +104,14 @@ bash bootstrap.sh --list                # List modules
 | [jq](https://jqlang.github.io/jq/) | Command-line JSON processor |
 | [lazygit](https://github.com/jesseduffield/lazygit) | Terminal UI for git |
 
+### Terminal Multiplexer
+
+| Tool | Description |
+|------|-------------|
+| [tmux](https://github.com/tmux/tmux) | Terminal multiplexer. Auto-starts on login; exit tmux to close the shell |
+
+tmux starts automatically when you open a new terminal and attaches to (or creates) a session named `main`. Closing tmux also exits the shell. To disable, remove `~/.zshrc.d/tmux.zsh`.
+
 ### File Management
 
 | Tool | Description |
diff --git a/README.zh.md b/README.zh.md
index 967cf18..20e5905 100644
--- a/README.zh.md
+++ b/README.zh.md
@@ -2,6 +2,7 @@
 [![macOS](https://github.com/long-910/dotfiles/actions/workflows/macos.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/macos.yml)
 [![ShellCheck](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml/badge.svg)](https://github.com/long-910/dotfiles/actions/workflows/shellcheck.yml)
 [![License](https://img.shields.io/github/license/long-910/dotfiles)](https://github.com/long-910/dotfiles/blob/main/LICENSE)
+[![Sponsor](https://img.shields.io/badge/Sponsor-GitHub-pink?logo=github)](https://github.com/sponsors/long-910)
 
 [English](README.md) | [日本語](README.ja.md) | [中文](README.zh.md)
 
@@ -14,7 +15,27 @@
 
 ## 快速开始
 
-### bootstrap.sh（推荐）
+### 一键安装（curl）
+
+用一条命令克隆并启动交互式安装程序：
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+非交互式安装所有模块：
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash -s -- --all
+```
+
+仓库将克隆到 `~/.dotfiles`，可通过 `DOTFILES_DIR` 自定义路径：
+
+```bash
+DOTFILES_DIR=~/my-dotfiles curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+```
+
+### bootstrap.sh（git clone）
 
 通过交互式菜单选择功能模块进行安装。
 
@@ -82,6 +103,14 @@ bash bootstrap.sh --list                # 列出所有模块
 | [jq](https://jqlang.github.io/jq/) | 命令行 JSON 处理器 |
 | [lazygit](https://github.com/jesseduffield/lazygit) | git 的终端 UI |
 
+### 终端复用器
+
+| 工具 | 说明 |
+|------|------|
+| [tmux](https://github.com/tmux/tmux) | 终端复用器。登录时自动启动；退出 tmux 同时退出 Shell |
+
+打开新终端时 tmux 会自动启动，并附加到名为 `main` 的会话（不存在则创建）。关闭 tmux 时 Shell 也会一并退出。如需禁用，请删除 `~/.zshrc.d/tmux.zsh`。
+
 ### 文件管理
 
 | 工具 | 说明 |
diff --git a/dotfiles/.zshrc.d/tmux.zsh b/dotfiles/.zshrc.d/tmux.zsh
new file mode 100644
index 0000000..e06538d
--- /dev/null
+++ b/dotfiles/.zshrc.d/tmux.zsh
@@ -0,0 +1,15 @@
+# shellcheck shell=bash
+# Auto-start tmux when opening a new terminal.
+# - If any session exists, attach to the most recent one.
+# - Otherwise, create a new session.
+# - When tmux exits, the shell (and terminal window) also exits.
+# Skip if: already inside tmux, tmux not installed, or VSCode terminal.
+if command -v tmux >/dev/null 2>&1 \
+  && [ -z "${TMUX:-}" ] \
+  && [ "${TERM_PROGRAM:-}" != "vscode" ]; then
+  if tmux list-sessions >/dev/null 2>&1; then
+    exec tmux attach-session
+  else
+    exec tmux new-session
+  fi
+fi
diff --git a/install.sh b/install.sh
new file mode 100644
index 0000000..4e048fa
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# install.sh — One-line installer for long-910/dotfiles
+# Usage: curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash
+#        curl -fsSL https://raw.githubusercontent.com/long-910/dotfiles/main/install.sh | bash -s -- --all
+set -euo pipefail
+
+DOTFILES_DIR="${DOTFILES_DIR:-$HOME/.dotfiles}"
+REPO="https://github.com/long-910/dotfiles.git"
+
+echo "=> Installing long-910/dotfiles into ${DOTFILES_DIR}"
+
+if [ -d "${DOTFILES_DIR}/.git" ]; then
+  echo "=> Repository already exists — pulling latest changes"
+  git -C "${DOTFILES_DIR}" pull --ff-only
+else
+  echo "=> Cloning repository"
+  git clone --depth=1 "${REPO}" "${DOTFILES_DIR}"
+fi
+
+# When piped from curl, stdin is the pipe (not a TTY).
+# Redirect from /dev/tty so the interactive menu can read keyboard input.
+if [ ! -t 0 ] && [ -c /dev/tty ]; then
+  exec bash "${DOTFILES_DIR}/bootstrap.sh" "$@" </dev/tty
+else
+  exec bash "${DOTFILES_DIR}/bootstrap.sh" "$@"
+fi
diff --git a/modules/core.sh b/modules/core.sh
index 5034019..9cda3d8 100755
--- a/modules/core.sh
+++ b/modules/core.sh
@@ -105,4 +105,5 @@ _deploy_core_configs() {
   deploy_config ".zshrc"    "${HOME}/.zshrc"
   deploy_config ".tmux.conf" "${HOME}/.tmux.conf"
   deploy_config ".emacs.el"  "${HOME}/.emacs.el"
+  deploy_zshrc_d "tmux.zsh"
 }