Reborn Arrives! is the first volume of the Katekyō Hitman Reborn! series.
- Chapter 001: That Guy From Italy ((イタリアからやってきたアイツ, Itaria kara yattekita aitsu?))
- Chapter 002: Dying Will Bullet Unusable ((死ぬ気弾使用不能, Shinuki-dan shiyō funō?))
- Chapter 003: Hayato Gokudera ((獄寺 隼人, Gokudera Hayato?))
- Chapter 004: Expel Crisis ((退学クライシス, Taigaku kuraishisu?))
- Chapter 005: Takeshi Yamamoto ((山本 武, Yamamoto Takeshi?))
- Chapter 006: Russian Roulette ((ロシアンルーレット, Roshian Rūretto?))
- Chapter 007: Crybaby Lambo ((泣き虫ランボ, Nakimushi Ranbo?))
Infant Reborn is a hitman for the Mafia. He is sent to Japan to train teenager Tsunayoshi Sawada so that he can become the next boss of the most powerful Mafia group, the Vongola Family. Tsuna considers himself a loser until Reborn shoots him with the Dying Will Bullet. This makes him stronger physically and mentally, allowing him to perform amazing feats. He is eventually able to become friendly with his crush, Kyoko Sasagawa, and befriends baseball player Takeshi Yamamoto after stopping him from committing suicide. As part of his training, he begins meeting members of the Mafia, who have mixed reactions to him. Dynamite expert Hayato Gokudera initially wishes to kill the boy, but later strives to become his right-hand man. Another infant assassin, Lambo, introduces himself by trying to kill Reborn, but instead starts living with them.