Dazai is a former executive of the Port Mafia, he was once feared for being executive during his profits. Despite being a youngest mafia executive, he was a mysterious person and his true identity was still concealed unless he reveals them. The person who got closest to the truth of his personality was his friend, Sakunosuke Oda who recognized that dazai shall linger in the darkness forever. In addition, dazai kept an enigmatic and dark facade.