Because of the rapid weight gain, Kokoro decided to hire a Yoga trainer to exercise with the hope of losing weight and having a slimmer waist. However, in exchange for getting rid of excess fat, she had to use her own body to trade off. This is because the Yoga trainer was too handsome and lustful. He always knew how to win women's hearts, perform seductive movements, stimulate the arousal of young girls, then freely engage in physical contact or even sexual relationships.