An old man who never got married and lived a leisurely life on his pension, but he had a problem: ``Even if I had a girlfriend, I would get bored with sex.'' One day, the old man and his girlfriend got into a fight and broke up, so he decided to call a delivery health service to relieve her loneliness. Then, the old man is captivated by the super professional level technique of the black gal Umi, and begs him to do it for real...