Wanna SpartanSex Spermax!!! Nagisa Kiryuu lives with his aunt after his family separated due to financial and family problems. However, in exchange for her support, Nagisa is given the mission of finding his missing cousin Yoshiyuki. Dressing as a man, he infiltrates the school where he used to study, which is full of thugs and gang members. It doesn't take long for him to find the group that used to bully his cousin, who also dared to cheat on his childhood friend, Aki. Thus, Nagisa discovers more and more of this intentions, however, his plans will have a sudden change...