Early in his career, Hissori was formerly an inhabitant of the Heisekai, acting as one of the Captain-Generals for the Shuuten's Third Division and an unofficial Royale Protector for the Ruling Monarch and the Jouin. However, Hissori left Heisekai after he unfortunately failed to protect one of his charges from an assassination. He voluntarily underwent a self-imposed exile to Soul Society where he was accepted into and served the Second Division. After the untimely death of Captain Akemi, Hissori was subsequently selected as the inherent replacement for the deceased Shinigami.