Wanna. SpartanSex Spermax!!! Episode 1

Based on the erotic game by Guilty eX. Tanabe Yoshiyuki disappears because of the frequent oppression done to her at school. Nagisa, Yoshiyuki's cousin, decides to dress as a man in order to find out what happened to her and take revenge on those responsible for the persecution. (Source: Translated and Edited from Nekopoi)