Ebisuzawa Kurumi, Takeya Yuki, Wakasa Yuri, and Naoki Miki all attend the same high school. They also live on campus at the school. The girls enjoy their time at the school until students become infected by a virus and turn into zombies. The girls are surrounded by student zombies and they struggle desperately to survive.
Kinichiro Imamura spent 3 years doing nothing in high school. On the day of his high school graduation, Kinichiro falls down the stairs at school. He soon realizes that he is back to the day of his high school entrance ceremony 3 years ago! Yoshiko Usami, who is the captain of cheerleading squad, talks to him. Kinichiro's second high school days starts again …