Dostoyesvsky has infected both Fukuzawa and Mori with the virus ability, 'Cannibalism'.

To save the life of one, the other must be killed in the next 48 hours. Under the cruel condition, the Armed Detective Agency and the Port Mafia engage in all-out conflict to protect their respective leaders.

As Atsushi and Kunikida struggle to prevent bloodshed, Dostoyevsky interferes as if to mock them.

The battle lines are drawn; Kyoka vs. Akutagawa, Ranpo vs. Chuya—!

Is there no way out of this predicament other than to dance to the tune played by the scheming "Devil"...?!!