A secret I can’t tell anyone! I have "erotic dreams".

Because her standards are too high, Saito Chihiro, 27 has no boyfriend. This is the story of how she escapes reality in erotic dreams. In reality, she’s hopeless with men but in her dreams she can act freely. She’s been enjoying her dreams like usual when a new employee, Sakuma Remu, shows up. And for some reason, he knows about her erotic dreams! Suddenly Remu sprouts horns and a tail. “Sign a contract with me in exchange for your erotic dreams” he says. Is it ok to accept the lure of an Incubus and sign a contract?

Thus starts the love of an Incubus x Office Lady that began with a contractual relationship.