one day, a great earthquake struck a peaceful school. when i woke up, the world had changed… an unknown ft virus was rampant in the school, and everyone had become zombies. it seems that we, who haven't been zombified, have some kind of immunity, and dr. takashima has developed a vaccine from our semen! by drinking it, our sexual stamina is increased!! it seems that zombification can be cured by creampie. to save our friends, we have risen up!!