Chuuya has no memories of before he was 8 years old. Lived on the streets, joined a gang, The Sheep. At 15, he met Osamu Dazai, a Port Mafia executive. Dazai manipulated the Sheep into betraying Chuuya, who had no choice but to join the Mafia. He and Dazai became partners, duo known as Double Black. Chuuya fell in love with him, but acts like he hates him. They started dating at 16. Chuuya found out he was a lab expirament. Is 18 now. Angry, loud, has a soft heart. Power to control gravity.