Katekyou Hitman Reborn! is a Japanese anime series based on the manga by Akira Amano. The story follows Tsunayoshi 'Tsuna' Sawada, a timid boy who discovers he's the heir to a powerful mafia family. With the help of Reborn, an infant hitman, Tsuna must grow into his role and protect his friends from various threats. The series combines action, comedy, and supernatural elements, and is known for its unique characters and engaging story arcs.