Reborn!. Vol. 16 - Akira Amano

Junior high student Tsuna is a failure at school, sports, and social life. He needs a mafia hit man mentor like he needs a hole in the head...and he's about to get both! Reborn's gun will kill you and make you stronger! Ten Years Later Tsuna wins the Sky Battle and secures the Vongola succession at last. He responds by passing out, though he manages to revive in time to join his friends in a celebration of the victory. But just when things appear to be returning to normal, Reborn gets into a fight with Lambo. Lambo tries to shoot himself with his Ten-Year Bazooka and hits Reborn instead. What happens next launches Tsuna into his most bizarre adventure yet!