The president of the Detective Agency is arrested, and Kunikida is missing after having blown himself up with a grenade. Meanwhile, Atsushi and Kyouka are on the run, looking for a way to defeat the true mastermind: Fyodor.
Detective employees are caught one after another, and Kamui, the leader of Tenjin Goshui, is closing in on the Armed Detective Agency. Will the Agency survive?!