Katekyo Hitman Reborn! (2006)

Hitman Reborn is the story of Tsunayoshi Sawada, a spineless teenager nicknamed 'No Good Tsuna.' One day a baby hitman shows up & tells Tsuna that he's to become the new boss of a powerful international mafia family. Over time he whips No Good Tsuna into shape to take on the evil Byakuran who wishes to take over the world.

Katekyo Hitman Reborn! is an action show featuring Takashi Kondo and created by Akira Amano.

Katekyo Hitman Reborn! is currently streaming for free (ad-supported) on Pluto TV and it's also available on Crunchyroll, Crunchyroll Amazon Channel and Hulu.