Tanihara Nozomi, a married woman and close friend of the mother, takes responsibility for watching the house while her friend's family is away on a trip. Living there is their young son, Atsushi, and Nozomi has never been the type to think of men in a sexual way. However, one night, Atsushi accidentally witnesses Nozomi masturbating. In that instant, his heart is shaken to its core and years of suppressed emotions explode within him. Overcome by the sight of her defenseless, aroused body, he pleads with her. Naturally, Nozomi refuses. Yet, as she's moved by the youth's sincere feelings and intense desire, her resistance slowly begins to fade. Through this process, she starts becoming aware of her own hidden emotions...