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. 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. 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. 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. He also starts making several friendships such as his crush Kyoko Sasagawa. 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. 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. Tsuna then unwillingly undergoes training from Reborn. 'Vongola IX', the current head of the family, sends Reborn, an infant hitman from Italy, to train Tsuna. For these reasons, Tsuna is the only remaining heir. Also, the other candidates for the position of the head of the Vongola Family have died. He is told by Reborn that he will become the tenth (Italian decimo) Vongola boss. 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.

Katekyo hitman reborn kyoko