Katekyo Hitman Reborn! is a manga series about a boy named Tsunayoshi Sawada who is the heir to a large organized crime family. Tsuna one day comes home and is greeted by a little baby mafioso who, apparently, is his new home tutor. His job is to guide Tsuna into his role as the 10th Boss of the Vongola family. With the help of all his new friends and an array of special items, such as the Dying Will Bullet, he might just be able to do it. Reborn! Wikipedia article.