[Machine Translation] Kogakusei High School is an educational school that measures all students based on their abilities. Ayanokoji Kiyotaka, a member of the bottom-ranked D class, is begged by the kind-hearted Kushida Kikyo, a beautiful girl, to help Sudo, a delinquent in his class who is in danger of being suspended from school due to a C class conspiracy. He also approaches his neighbor Suzune Horikita, but for some reason she is reluctant to help him. The only hint the bright Suzune gives him is the existence of his classmate, a simple girl named Airi Sakura. As they track her down, Kiyotaka and his friends discover Airi's hidden secret... They are also joined by Ichinose, a mysterious beautiful girl from class B, and take on the challenge of rescuing Sudo! The second installment of a new school apocalypse from the popular creator duo!