Tetsuro Tanaka is transferred to Gokoh Academy full of high expectations. However, expectations fade with a bad premonition the moment he steps onto the campus and finds all the students except him are girls. A series of strange events fall upon him. Then, six girls who are called Koi Koi Seven appear as his guardians. Army combat helicopters and anti-tank guns attack Tetsuro for no particular reason as he tries to survive each day in the academy.