Katekyo Hitman Reborn!

is about a boy, Tsunayoshi "Tsuna" Sawada, who is chosen to become a Mafia Boss. Tsuna unwillingly undergoes training from Reborn, a hitman from Italy. Timoteo a.k.a. "Vongola IX," the head of the Vongola Family, sent Reborn to train Tsuna; the first Vongola boss moved to Japan, and Tsuna was his great-great-great grandson; the other candidates for the position of the head of the Vongola family died. Enrico, who was the leading candidate to become "Vongola X", died in a gun battle. Massimo, the second, "sleeps with the fishes." Federico, the favored son, was found as a pile of bones. For these reasons, Tsuna is the only remaining heir.

Reborn's main instrument of choice in teaching Tsuna is the "Dying Will Bullet" ("Deathperation Shot" in the English versions), which will make the person be "reborn" with a stronger self intent on fulfilling his dying will.

The manga is also readable at Online Manga Reader

Katekyo Hitman Reborn anime has been promoted to 2007's 2nd best anime of the year. By a poll in japan. (source: Danny Choo : Anime, Figures, Idols, Gundam, Otaku and Events from Japan )

Katekyo Hitman Reborn Opening 2 Watch the madness of the awesome second Opening!

If you've loved the manga, you'll love the anime as well, It's superbly great! It's funny has good action, just great overall

If you don't want to bother downloading the series, you can watch it here online. Fast loading, same quality as downloadable anime!