After managing to defeat Leonhart, the participants were able to escape the Calamity, but Akira and Yuri were left behind. As Akira and Yuri attempted to find a way out, Mion naughtily hatches a scheme and tricks them to do some NAUGHTY TASKS as a condition to escape the Calamity, which Akira and Yuri are compelled to accept in order to return to the real world
AU retelling. 14 individuals were mysteriously abducted and brought to what appeared to be an abandoned city, where the apparent instigator, Mion, forces the victims to participate in a Battle Royal where only the sole survivor would get a prize and resume his/her normal lives. The victims have no memory of their previous life other than their names, and have a time limit of 7 days