At the behest of Mori, the boss of the Port Mafia, a young Dazai and Chuuya launch their investigation into the rumours of the previous boss’s revival, as well as the mysterious “Arahabaki” that’s somehow involved.

The two’s mission carries the utmost importance, for if the truth about Mori’s predecessor gets out, the streets of Yokohama will run red with blood. Randou, one of the Mafia’s sub-executives, is said to have witnessed the supposed god, but where will his information lead?