sentences:  Because of his severely low self-esteem and lack of talent in any activity, Tsuna is known as at his middle school, Namimori.After being informed that he is the heir to the Vongola Family, due in part to him being the great-great-great grandson of the first Vongola boss from 400 years ago, as well as the untimely deaths of the other candidates for the position, he is trained into becoming a mob-boss by the infant Vongola hitman Reborn.Tsuna is often shot by Reborn with a bullet that increases his physical abilities in order for him to fulfill his regrets.