Meisa liked visiting her father-in-law, Tomohiro, who lived alone near her home, and taking care of him daily. To her, he was someone who always showed genuine concern for her well-being, and she deeply appreciated his kindness. In stark contrast, her husband, Hiroyuki, was indifferent and showed no interest in her. Exhausted by this emotional neglect, Meisa one day reached her breaking point, stormed out of the house, and headed straight for her father-in-law's place. However, she collapsed on the way, her condition worsening due to a high fever. When she realized Tomohiro was nursing her back to health, she asked him in the bathroom to wash her back, standing before him completely naked. In that moment, their relationship took a sudden, irreversible turn.