An old man lives a leisurely life on his pension without ever getting married, but he has a problem: "Even if I get a girlfriend, I get bored of sex." One day, he gets into a fight with his girlfriend and breaks up with her. To ease his loneliness, he calls a delivery health girl. When the black gal Umi arrives, the old man is Kokoro by her super professional technique, and begs her to have sex with him somehow...