Hitman Reborn Episode 1 – “What!? I’m the Tenth Generation Mafia Boss!?”

A strange infant, Reborn, claiming to be a hitman for the Mafia approaches Tsunayoshi “Tsuna” Sawada. To Tsuna’s dismay, he has just been chosen to become the next Vongola boss. Later as a result of Tsuna actions, due to the Dying will bullet, he his challenged to a duel, in Ken-do, against Mochida-senpai. The reason stated is that this is revenge for making Kyoko cry and all Tsuna has to due is get one point to win. (source)