The story centers around middle school student Tsunayoshi "Tsuna" Sawada, who finds out that he is the heir to the most powerful Mafia family, the Vongola. The current Vongola boss thus sends his most trusted member, the titular character and infant hitman, Reborn, to train the future boss. Tsuna gradually becomes a more confident person and leader, while Reborn slowly recruits members into Tsuna's own Mafia family, which mostly includes Tsuna's schoolmates. Though they encounter new allies in the form of other hitmen and mafiosi, they also attract attention from those who want to annihilate the future boss of the Vongola Family. Enemies such as the Kokuyo Gang, a group of Mafia criminals, and The Varia, an elite team of assassins, prove to be formidable challenges for Tsuna's new "family"