Yuusuke Yotsuka has always despised Tokyo, but he despises its inhabitants even more. He would prefer exist in a virtual world than interact with those around him. At the conclusion of one school day, he notices prominent athlete Iu Shindou conversing with Kusue Hakozaki, who is absent from school due to sickness. However, when he glances away from the two and then back, they appear to have vanished. Yotsuya immediately enters free fall, and the world around him begins to shift. When he returns to after falling into a big pool of water, the first thing he sees is a swarm of monstrous creatures. He quickly discovers that he has been taken here.