Izumi Kyoka tried to end her life so she wouldn't have to kill for the Port Mafia anymore. After Nakajima Atsushi saves her, he treats her to her favourite tofu, ostensibly to gather information about the Mafia... but this fleeting peace is interrupted by Akutagawa's nefarious scheming. Meanwhile, Dazai is being held by the Mafia, where he encounters a familiar face – his former partner and arch-enemy, Nakahara Chuya! Dazai Osamu vs Nakahara Chuya; Akutagawa Ryunosuke vs Nakajima Atsushi – What will be the outcome of this bloody confrontation between the Agency and the Mafia?!