For his graduation exam, incubus Alkeros is tasked with sleeping with a superior human being, Koutarou. Unfortunately, Koutarou's corporate lifestyle has resulted in erectile dysfunction. Alkeros decides to move in with Koutarou without an invitation to ensure he doesn't miss his chance. However, things don't go as planned, and Alkeros finds himself being the one aroused instead. "Today was meant to be the day I helped him become aroused, yet I'm the one being touched and getting turned on... what happened?"