[Furitendou] Gakuenchuu no Joshi ga Bitch-ka Virus ni Kansenshi Saru Nami no Chinou ni Natta node Joshiseito Zenin no Manko o Tsukaisute Onaho ni shite Onanie shite mita
05 MC explains that everyone is infected with an estrus virus... 06 ...except for him because he has natural immunity. 07 He's taking aphrodisiacs to last longer.