Haruki, an office worker who loves boys' love comic books, is fascinated with incubi. One day, he jokingly recites a summoning spell... and makes a beautiful incubus appear before his eyes...!? A well-proportioned-face, an attractive body, a firm bottom... he is so perfect that it's beyond exciting! Unable to return to the demon world, Allen wants to steal Haruki's vitality, but he has never done it with a man...!! The way he moans in pleasure and sinks deeper and deeper in ecstasy is just too cute... "Incubi are really so naughty." The story of a sweet but sadistic office worker together with a sassy virgin incubus starts now!