Asahi, a married woman living alone with her son during her husband's long business trip, begins to open up to Koome, her son's classmate, after empathizing with the girl's complicated family situation. Drawn to Koome's gentle demeanor, Asahi gradually lets her guard down. But Koome takes advantage of her vulnerability, deepening their connection step by step. Torn by guilt yet overwhelmed by the long-forgotten pleasure of intimate touch, Asahi finds her emotions consumed by desire. As her relationship with her son's classmate intensifies, primal instincts awaken, eroding her rationality. Caught between conflicting feelings and mounting lust, she surrenders herself to a life of forbidden passion.