A slightly unstable, black-haired, delicate-looking beautiful boy named Kaon. She desperately wants to become a gorgeous, cool girl and puts great effort into makeup and body care. However, her body has one troublesome trait: her entire body is hypersensitive, she has a strong masochistic tendency, and even slight stimulation sends her into orgasmic fits with distorted facial expressions and rolled-back eyes. Just touching her back or thighs causes her body to spasm violently. When her weak spots—nipples and penis—are teased, she instantly squirts with eyes rolled back and loses consciousness. Today, she's once again summoned by her middle-aged, chubby "master," forced to endure strict training as her ass clenches hard with arousal, moaning and making twisted faces throughout the session.