The world has collapsed due to a zombie pandemic. The protagonist, Mikoto Amano, wakes up in an unfamiliar place with no memory and is taken in by six girls. However, a shocking incident occurs: a man who was taken in alongside Mikoto is murdered, and the culprit is one of them.<br><br>

Set in the Tokyu Kabukicho Tower, mysteries and secrets unfold one after another within the now-sealed building. Will the girls, who have begun to form a bond, be able to uncover the truth behind the incident?<br><br>

(animated Times, translated)