Masao, a guy with no money, hobbies, or girlfriend, was living a monotonous life until one day he found an injured succubus named Mei and took her in to nurse her wounds. It turned out that Mei, a low-ranking demon, had come to the human world against her will and was now unable to return to the demon realm. Feeling sympathy for her plight, Masao decided to help Mei regain her magical powers, but the method turned out to be... creampie sex!?