Tsunayoshi Sawada is a timid, good-for-nothing, teenage boy nearing the end of his high school years. He is horrible at sports, atrocious in his studies and his social interactions can only be described as pathetic. He does not have any friends and lives everyday expecting nothing but the worse out of himself. That is until one fateful day, he meets a hit-man. A hit-man that wants him to become the next head of the most powerful mafia family in the world...