After becoming pregnant by a boss who refused even to acknowledge the child, Toko spent ten years working tirelessly so her daughter Yuki would never suffer for having a single mother. With graduation, employment, and marriage seemingly ahead, that bright future is threatened when Toko unexpectedly sleeps with her daughter's boyfriend. Torn by guilt but unable to suppress years of pent-up desire, she is overwhelmed by electrifying pleasure, convulsing and arching as she gives herself to the affair.