The first morning of summer break. Makoto woke up and immediately realized something was wrong. "Why won’t this boner go away!?" Out of nowhere, a maid showed up and proceeded to drain him dry with her mouth…!? After that, he was taken to his late grandfather’s estate, where he was told about the "power of the incubus"—a force so intense that losing control of it could turn someone into a total pervert. He also learned about his grandfather’s will: "If any relative shows signs of this power, they are to become the successor of Ikuma Holdings." And so, with the incubus power now awakened in him and his libido spiraling out of control, Makoto set out to fulfill his grandfather’s wishes. Together with three maids, he began a series of very hands-on training sessions to learn how to keep the incubus power in check.