Hardened hit man Juzo Ogami's in for the mission of his esteemed career.life as an average middle school student! Juzo Ogami has never led a normal life. He was picked up by a criminal organization as a child and grew up to become a legendary hit man. But everything changes when he's bitten by a mysterious insect and becomes a teenager again! Can this battle-hardened assassin handle the rigors of middle school life?! During their summer vacation, Ogami, Tenma, and the others go to Noren's villa on a remote island, where rumors abound of ghostly sightings. Could there be a connection between this mysterious villa and the venom that transformed Ogami into a kid?.