Kyoka, now an official member of the Armed Detective Agency, is given a work request from an anonymous client.

But while Kyoka and Atsushi are investigating, Montgomery gets in the way...!

A man thought dead re-appears, while Dostoyevsky finally bares his fangs at the Agency and the Mafia.

Slowly but surely, the man feared as the devil begins to devour the Yokohama underworld...