While visiting her hometown to pay respects at the family grave, Mao happens to reunite with a teacher from her adult student days. Drinks at a bar lead to a one-night stand, where she discovers his love of bondage and awakens to the unfamiliar pleasure of being tied up. Self-bondage masturbation can no longer satisfy her, so while her husband is away on business, she joins her former teacher for a two-day, one-night affair and bondage-training trip.