Humans are summoned and forced to fight for their lives by a mysterious black sphere at the last moment of their lives. Kurono loses Kato, his beloved friend, he struggles through the following missions to bring Kato back. One day, Kato, who is supposed to be dead, appears and Gantz seems being thrown off balance. In this situation, Kurono is entrusted with a mission to go after Kozima, his lover…