Arisu, an unemployed former student and video game enthusiast, suddenly finds himself catapulted into the alternate Tokyo of a "Borderland" identical in every way to the real one, but deserted and ruined. In the company of two friends, the tough Karube and the erotomaniac Chota, Arisu will be forced to face a real survival game in that desolate scenario, in the form of a sequence of games with potentially... deadly difficulty. Will the three boys be able to survive this new, dangerous world? Who created all this? But, above all, is there a way for them to return to their original lives?