Shoumi, a 40-year-old mother, travels with a close friend and stays at a hot spring inn. While soaking in the mixed-gender bath, she suffers from overheating and is tenderly cared for by a man she meets there. This intimate encounter sparks a deep attraction within her, and as they exchange glances and brief touches, she finds herself genuinely thinking, "I want to see him again..." When the two unexpectedly cross paths once more at the inn, Shoumi can no longer suppress her emotions. She confesses her feelings, giving in to a single night of forbidden passion. Their connection quickly deepens, pulling them into a love affair that seems impossible to walk away from.