In the emotional conclusion to the "Dark Era" arc, Oda Sakunosuke faces off against André Gide, with their "Flawless" abilities leading to a tragic, mutual death that fulfills Gide's wish for an honorable end. Orchestrated by Mori Ougai to secure a business permit, this confrontation marks a turning point for Dazai Osamu, who arrives too late to save his friend. Oda's final plea for Dazai to protect others leads to Dazai leaving the Port Mafia to join the Armed Detective Agency, embracing a new, lighter path.