Kunou is a college student who harbors a secret unknown to anyone - he is a succubus who feeds on semen. He has a rare medical condition that causes his body to become ill if he ever ejaculates. One day, while running into Watarase, a reputedly promiscuous gay man, Kunou surmises that he would be an easy target to satiate his needs. However, to Kunou's surprise, Watarase turns out to be a total bottom, leaving Kunou feeling drained and at a loss on how to deal with this new development.