Nobuko's loneliness was slowly reaching its limit. Ever since her son Takashi was born, her husband had grown indifferent toward their marriage, leaving her trapped in a long-term sexless relationship. Unable to endure it any longer, Nobuko resorted to daily masturbation to relieve her pent-up desires. One day, by chance, Takashi happened to pass by and saw his mother looking deeply lonely. He began to wish he could do something to comfort her, even though she thought she wasn't particularly close to him. Still, moved by his kindness, Nobuko's heart began to waver, and gradually their relationship started to change. Takashi's unexpectedly large, sturdy frame drew Nobuko in, and soon he became an irreplaceable presence she could no longer let go.