After losing her husband, Shizuka lives alone with her only son. Now an adult and earning his first salary, he plans a one-night trip as a gesture of gratitude to his mother. He has long viewed her not just as a parent, but as a woman, struggling with feelings that cross familial boundaries. Shizuka, too, has gradually become aware of her son as a man through their daily life together. This journey becomes the turning point where both finally confront their hidden desires, bringing their emotions together for the first time.