It began—six years ago.
The 88-days long “Dragon’s Head Dispute”, which drew in each and every organization into a violent storm of blood, went down in the history of Yokohama’s underbelly as the dispute with the largest number of fatalities. Osamu Dazai, who had escaped death together with his Port Mafia ally, Chūya Nakahara, clung onto the words of his dead friend and bid farewell to his boss, Ōgai Mori, and he was only seen in his new place two years afterwards.
The Armed Detective Agency, formed on the foundation of Yukichi Fukuzawa's ideals, welcomed Atsushi Nakajima and Kyōka Izumi as their new members, and they are living boisterous yet peaceful days.
However, strange incidents of Ability users around the world successively committing suicide are happening now. Incredibly, more than 500 Ability users have used their own Abilities to kill themselves. And at every site, an inexplicable “mist” had been found.