Genre: Comedy, Action,Supernatural
Original Name: Katekyō Hittoman Ribōn! (aka Katekyō Hitman Reborn!)
In Reborn! a boy, Tsunayoshi “Tsuna” Sawada, is chosen to become the tenth boss of the Vongola Family, as he is the great-great-great-great grandson of the first Vongola boss—who moved to Japan from Italy. Timoteo, the Vongola IX—the current head of the family—, sends Reborn, an infant hitman from Italy, to train the reluctant Tsuna. Reborn’s chief teaching method is the “Deathperate Bullet”, which causes a person to be “reborn” with a stronger self to execute his dying wish. The clumsy, underachieving Tsuna becomes stronger, more confident and willing, making him a suitable Vongola family boss despite his continued reluctance. He makes several friends, including Kyoko Sasagawa.
Tsuna gets out of many scrapes on his way to becoming the Vongola boss, fighting escaped Mafia convicts posing as Kokuyo Junior High School students. The Varia, the Vongola assassin squad, want their boss, Xanxus, to be the Vongola boss and initiate a competition with Tsuna. To defeat the Varia, Reborn recruits Tsuna’s schoolmates as Vongola guardians: Hayato Gokudera, an explosives expert who wants to be Tsuna’s right-hand man; Takeshi Yamamoto, an athlete who likes baseball and thinks of the Mafia as a game;Ryohei Sasagawa, captain of the school boxing club, and head prefect Kyoya Hibari; Lambo, a weak infant hitman who wants to kill Reborn; and Chrome Dokuro, a girl with links to the criminal Mukuro Rokudo, also join them.
After defeating the Varia Tsuna and his friends are transported to the future to face the Millefiore family, who are killing the Vongolas. They discover that the Arcobaleno, the seven strongest infants, are dead except for Lal Mirch. When Tsuna and the Vongola guardians fight the Millefiore, they learn that Shoichi Irie, a comrade of Tsuna’s future self, sent them to the future because the future Tsuna said they were the only ones able to defeat Millefiore leader Byakuran. Byakuran, who has obtained knowledge from parallel worlds, wants to obtain all the Mafia rings to become omniscient.
Tsuna and his group defeat Byakuran and return to the present, where they learn that he is to be installed as Vongola X. The ceremony is disrupted by the Shimon Family, who have sworn revenge on the Vongola founding father for allegedly betraying the first Shimon boss. Tsuna confronts the Shimon Family on a secluded island; another Mafia family, the Vindice, are involved in the fight and imprison the losers. After several battles it is learned that Daemon Spade, an illusionist and first Vongola generation guardian, was manipulating Shimon, using the conflict to control Mukuro Rokudo and remake the Vongolas in his image. The combined strength of Tsuna and Shimon’s leader, Enma Kozato, defeats him.
After Tsuna reconciles with Shimon, Reborn and the other Arcobaleno compete among themselves to remove their curse. Each Arcobaleno chooses a representative to fight for them, and the winner can undo the curse. The Vindice enter the competition, informing Reborn and Tsuna that the tournament is a front for the selection of a new Arcobaleno; the previous Arcobaleno die or become Vindice. Tsuna joins the remaining teams to defeat Bermuda, a former Arcobaleno, and the Vindice. On the final day of the Representative Battle of the Rainbow, Tsuna defeats Bermuda and his team. Checker Face, who inflicted the Arcobaleno Curse of the Rainbow, reveals his true identity as Kawahira, administrator of the humankind’s ultimate power, Tri-ni-set. Finding another way to keep the Tri-ni-set safe, Kawahira agrees to entrust it to future generations and remove the curse.
After the Arcobaleno battle, Tsuna refuses to become the tenth head of the Vongola Family and Reborn leaves. A week after his departure, Tsuna realises that he is still his no good self; nothing has changed. Reborn returns to train Tsuna as Neo-Vongola Primo, similar to Vongola Decimo; Tsuna remembers that he now has friends he can rely on and has been changed by his experiences, thanks to his tutor and partner Reborn.