Mai and her gymnastics coach share a secret love. Unfortunately, she has a boyfriend, while her instructor is married to the school director's daughter. Despite these obstacles and their teacher-student dynamic, they both succumb to their desires, and their relationship proceeds smoothly... Until the wife discovers the truth. She is furious that her husband has been taken by a young girl. She convinces Mai's boyfriend to assist her, and together they execute a plan to punish and publicly humiliate Mai...