While visiting her hometown to pay respects at a grave, Mei unexpectedly reunites with a teacher from her school days. Drinks at a bar lead to a one-night stand, and she discovers that he loves bondage. Being tied for the first time awakens an unknown pleasure she cannot forget. Self-bondage masturbation is no longer enough, so while her husband is away on business, Mei joins her former teacher for a two-day, one-night affair and bondage-training trip.