On the day when cherry blossoms scattered, Ango Sakaguchi, a young executive of the Port Mafia, stood frozen before the lifeless body of his dear friend, Oda Sakunosuke. His friend was dead because of him. In that despair, his special ability 'Discourse on Decadence' went berserk—making even time itself an 'excuse' to rewind, sending him back to the past. When he came to, Ango was four years in the past. It was the time before everything began. Oda was alive. Dazai Osamu was laughing. He had ju