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Reborn!, known in Japan as, is an ongoing Japanese manga written and illustrated by Akira Amano. The plot revolves around the life of a young boy named Tsunayoshi Sawada, who finds out that he is the next in line to become the boss of the most powerful Mafia organization, the Vongola Family. As such, the Vongola's most powerful hitman, a gun-toting infant named Reborn, is sent to tutor "Tsuna" on how to become a respectable boss.

The individual manga chapters are serialized in Japan in Weekly Shōnen Jump. The individual chapters are collected and published in tankōbon volumes by Shueisha, with twenty-seven volumes released as of October 2, 2009. Viz Media licensed the series for an English language release in North America, shortening the series name to Reborn!. An anime adaptation of the series premiered in Japan on October 7, 2006 and it is still ongoing. It is developed by Artland and is airing on the television network TV Tokyo. Various video games based on the series have been developed, with several of them being for the Nintendo DS. Additionally, Hideaki Koyasu has authored two Reborn! light novels.

Reborn! has become one of the best-selling Weekly Shōnen Jump manga with several of its volumes becoming top-sellers in Japan. They also mentioned that though it has become more violent since volume 8, it has turned into a better shōnen series, praising the storylines and the fights.

Plot
The Reborn! story revolves around a boy named Tsunayoshi "Tsuna" Sawada, who is chosen to become the Vongola Family's boss due to him being the great-great-great-great grandson of the first Vongola boss, who had moved to Japan from Italy during his time. He is told by Reborn that he will become the tenth (decimo/Italian) Vongola boss. Also, the other candidates for the position of the head of the Vongola Family have died. For these reasons, Tsuna is the only remaining heir. As such, Timoteo a.k.a. "Vongola IX", the current head of the family, sends Reborn, an infant hitman from Italy, to train Tsuna. Tsuna then unwillingly undergoes training from Reborn. Reborn's main method of teaching Tsuna is the "Dying Will Bullet", which will make the person be "reborn" with a stronger self intent on fulfilling his dying will. Through his experiences, Tsuna unconsciously becomes stronger and more confident, which ultimately makes him better suited as the Vongola Family's boss despite continuing to reject his Mafia inheritance. He also starts making several friendships such as his crush Kyoko Sasagawa.

Tsuna goes through many predicaments in his progress of becoming the Vongola boss including fighting against escaped Mafia convicts posing as Kokuyo Junior High students. Later, The Varia, Vongola assassin squad, claim the right for their boss, Xanxus to be the true Vongola boss, and start a competition to decide it. To defeat the Varia, Reborn recruits most of Tsuna's schoolmates to become the Vongola guardians: Hayato Gokudera, a dynamite expert who wishes to be his right-hand man, Takeshi Yamamoto, a baseball player who thinks the Mafia is a game, Ryohei Sasagawa, the energetic captain of the school boxing club, and Kyoya Hibari, the deadly head prefect. Lambo, a weak infant assassin who came to kill Reborn, and Chrome Dokuro, a girl who has a mental and physical link with the criminal Mukuro Rokudo, joins them as well. Later, after defeating the Varia, Tsuna and his friends are transported to the future where they must face the Millefiore Family, who are annihilating the Vongola. As Tsuna and the Vongola Guardians from his time fight the Millefiore they learn that Shoichi Irie, a comrade of Tsuna's future self, was the one who sent them to the future as the future Tsuna said they were the only ones who can defeat the Millefiore leader Byakuran. It is later revealed that Byakuran has gained knowledge from parallel worlds and that he wants to obtain all the Mafia rings in order to obtain a power similar to omniscience. However, Tsuna and his friends are able to defeat Byakuran and the Millefiore and return to the past.