After losing her husband in an accident, Sachika Akimoto lived with her son. Four years ago, they had a one-night stand. That forbidden door, once opened, left an indelible mark on her memory. One day, her son decided to take a trip to a hot spring resort before starting his new job. It seemed like he was secretly drawn to his mother, perhaps because he saw a resemblance to his deceased father. Every time their skin touched, a spark ignited between them. This is a tale of forbidden incest, where they give in to their desires and repeatedly engage in intimate acts.
