Following the devastation of the Third World War (known as The Third Division), Japan was split into two. Several years after the war ended, a criminal organization called Vischio seized control of the ruined city of Toshima (formerly Tokyo, Japan's capital), where they host a battle game known as "Igura". The game's protagonist, a young man named Akira, is wrongly accused of a crime. After his arrest, a mysterious woman appears before him, offering him freedom if he agrees to participate in Igura and defeat its strongest fighter: the king, or "Il-re". The narrative tracks Akira's life in the harsh, lawless Toshima as he fights for survival and seeks to uncover the mysteries unfolding around him.