Yuki Takeya is a cheerful high school girl who lives at school and spends time with the School Living Club alongside fellow members Kurumi Ebisuzawa, Yuuri Wakasa, and Miki Naoki, and their advisor, Megumi Sakura. During classes, Yuki and Miki chase after their pet dog, Tarōmaru, who decides to go wandering off on his own, eventually tracking him down. Later on, as Miki accompanies Yuki as she retrieves her bag from class, it is revealed that Yuki's view of a rosy school life with her fellow classmates is all in her head. In reality, she and the other members of the School Living Club are the only survivors of their school following a zombie outbreak.