"Why are you getting aroused...? That's not fair." In a world where the entire human population has been affected by the lingering effects of a pandemic and developed erectile dysfunction, high school student Kazuki is the only one who can still get an erection. If his secret is discovered, he could be condemned to a life as a guinea pig... he doesn't want that! He transfers to a new school in order to protect his secret, only to find out that it's an all-girls harem academy!? Even the kind and diligent student council president, Himeko, changes her attitude towards Kazuki once she realizes he can still get aroused – "If you feel sorry for me... then do it with me?" Himeko becomes excited, her breath growing rough, slowly undressing and intertwining their tongues...