Today, the underworld is ruled by a family of Italian Mafiosi Wongola. The last chapter of Vongol, the ninth in a row, is preparing to retire. But before retirement he will need the help of a professional killer Reborn in order to prepare himself a successor and give him the reins of government of both Vongol and the whole underworld. Tsunayoshi Savada an ordinary schoolboy-loser, a high school student. She does not enjoy success with the girls, has no friends and is hopelessly in love with a classmate. His life is irrevocably changed when a strange kid named Reborn (2) claims to be his killer, and Tsunayoshi is a mafia in the tenth generation, and he is destined to become the boss of the underworld. And so that he does not mind, he is open to hunting, and without Reborn , he simply can not survive.