Yuko, whose husband is away on a work assignment, suffers from sexual frustration and wanders through her daily life, indulging in masturbation in the bathroom every night. One day, her son's friend accidentally discovers her vibrator and proposes using her to satisfy his own sexual desires. Without her son finding out, her son's friends continue to tease and seduce her, gradually overtaking her mind and body with pleasure. The story depicts the emotional turmoil she experiences and the unknown path that awaits her ahead.