Kuniyuki Kobayashi works for a publishing company, and is a completely regular guy, save for one thing. His body switches between male and female whenever he reaches the peak of physical pleasure. When he gets assigned to Haru Misaki, a wildly popular author and his best friend as his editor, he changes into his female self, Yuki to keep his job. Everything is going well until Haru finds out Yuki's secret and demands that she serve him as a woman to make up for all the lies! What's Kuniyuki to do!?