Unable to satisfy her marital sex life, Mio is seduced by her friend Chisato. Awakening to a relationship with another woman, she becomes aware of her long-repressed desires and falls under the spell of Chisato's mature lesbian affection. As their big breasts press together and their wetness mingles, Mio sinks deeper into lesbian dependency. During daylight hours, in the absence of her husband, she discovers a new side of herself.