[Machine Translation] The detective agency's team visited Standard Island, a "sailing island" in the seas around Yokohama, to exterminate bandits. However, an unprecedented alien weapon is about to be activated there by terrorists. In pursuit of the enemy, Atsushi is confronted by an alien named H.G. Wells. Atsushi wonders if she is friend or foe, but the time is running out... And as Dazai arrives at the truth, the mastermind's deadly blade closes in on him...! The long-awaited fourth novel by the author of the hit comic series!