At 39 years old, Ayaka Miyazaki finds her son entering puberty, becoming instantly aroused at the sight of women. Unable to handle his urges, he turns to his mother Ayaka for help. Though she gently supports him, her actions become a crucial step in his development. Two years later, now a working adult, her son still knows nothing about masturbation. Faced with this situation, Ayaka resolves to discipline him properly.