An Assassin can't be a Mafia Boss

After Class E completed their mission Tsuna returned to Namimori with bet friend Nagisa in tow. Only to have a hitman by the name of Reborn arrive with pans to train Tsuna to be a mafia boss. No thank you. Tsuna is perfectly happy as a part tie assassin and proud member of 3E combat/assassination squad. Unfortunately, Reborn doesn't take no for an answer.