Reborn!

Tsunayoshi "Tsuna" Sawada, an unskilled and timid boy, is identified as the heir to the Vongola Family due to his direct descent from the organization's founder. The current Vongola boss, Timoteo, dispatches the infant hitman Reborn to Japan to tutor Tsuna and prepare him for leadership. Reborn employs a unique training tool, the "Dying Will Bullet" (死ぬ気弾, Shinukidan), which forces its target to pursue their final regret with a powerful, resurrected determination. Through this method, the reluctant Tsuna gradually develops greater confidence and strength, making him a more suitable candidate. He forms close bonds with several schoolmates, including Kyoko Sasagawa.

His progression is challenged by various threats, beginning with a group of escaped mafia convicts. A more significant conflict arises with the Varia, the family's assassination squad, who support their own leader, Xanxus, for the position of Vongola boss. To confront them, Reborn enlists Tsuna's peers to serve as his guardians: Hayato Gokudera, a dedicated bomber expert; Takeshi Yamamoto, a talented athlete who views their conflicts as a game; Ryohei Sasagawa, the boxing club captain; and the head prefect, Kyoya Hibari. They are later joined by the infant hitman Lambo and a mysterious girl named Chrome Dokuro, who is connected to the criminal Mukuro Rokudo.

Reborn! was written and illustrated by Akira Amano. She had previously authored several one-shots and a single, short serialization in Kodansha's seinen manga magazine Weekly Young Magazine before debuting in Shueisha's Weekly Shōnen Jump in 2003. Reborn!

was published as a one-shot late that year before starting as a serialization the next year. The editorial staff had approached Amano about doing a series that had both gag and action elements. She enjoyed comedy so she began with a style that leaned heavily into jokes while simultaneously planning how its characters would later connect into a larger, overarching narrative. She attempted to create threads that would eventually tie together, even during the episodic vibe of the beginning of Reborn!

The Reborn! manga has been popular in Japan and, according to Mainichi Shimbun, has one of the greatest number of cosplayers in the country. In 2007 it was the tenth-bestselling series in Weekly Shōnen Jump, with a total of seven million copies sold; in 2008, its sales increased to 15 million copies. Reborn!

was among Japan's top-selling series for several years. 3 million copies, the country's fourth-bestselling series. In 2009 it was the sixth-bestselling series in Japan, with sales of 3,694,323 copies. In 2010 Reborn!