Yume is a failing succubus that isn't good at dirty stuff. One day, she fails her exam at the succubus school, and is sent to the human world for training. After her parents suggest she possess the popular romance novelist Eigo Sawanoi, Yume rushes to him. Coincidentally, his new housekeeper was supposed to start on the same day, so Eigo mistakes Yume as the housekeeper. Though he's hesitant at first, he passionately teaches Yume dirty things and...?