sentences:  However, Yamamoto is oblivious to the fact that he and his friends are mafioso, believing that they are playing a mafia game and that Reborn's weapons are just toys made with advanced technology.He is also optimistic to the point of naïvetè; although many of the opponents he meets during the series attempt to kill him, Yamamoto searches for a way to defeat them without mortal injury, such as using the back of his blade or not dealing a killing blow, and attempts to save his opponents as they are about to die.Even after accepting his role as Tsuna's Rain Guardian and the Vongola's swordsman, he continues to balance his life between baseball and swordsmanship, only devoting himself to swordsmanship when he needs to protect his friends.