High schooler Casio visits an old amusement park with friends despite rumors that people vanish there. The outing ends in violence, but instead of staying dead, Casio wakes at the beginning of the same morning and discovers he cannot leave the repeating day. His search for answers leads to Asebi, a mysterious girl who says she has been trapped in the park’s loop far longer than he has. Together they must uncover why the day keeps resetting and what the park demands from anyone who wants to escape.