Chihiro Saitou (27) has never had a boyfriend because of her too-high standards. So, in order to forget about reality, she loses herself in super lewd fantasies. One day, while she's lost in a steamy daydream, the new hire, Rem, suddenly hugs her from behind. She is surprised to find that he is reenacting her fantasy perfectly... when he suddenly grows horns and a tail, and asks her to make a deal with him in exchange for her fantasies...! He can reenact her fantasies so perfectly, the pleasure lingers in her body for a while afterwards!! Is it really okay to make a deal with an incubus!? A love story starting from a contract between an incubus and a fantasy-driven career woman.