It tells the story of Kurumi Ebisuzawa, Yuki Takeya, Yuri Wakasa, and Miki Naoki attending the same high school in Japan, but they also know one another because they reside in the school's dormitory and having a school club. The schoolgirls are having fun until a zombie outbreak occurs, infecting the school population. The four girls must now learn to survive in this new land if they want to stay alive.