Mother Sayuri and her son Noriyuki are on a family trip together. Shy and reserved, Noriyuki became emotionally detached after witnessing the traffic accident that took his father's life several years ago. Since then, he has needed ongoing treatment at a psychiatric hospital. Sayuri is his stepmother, and at the time, there had still been some emotional distance between them. This trip was meant as part of Noriyuki's therapy—Sayuri brought him to a company resort linked to her factory job. However, for Sayuri, this journey would become much more than just a healing experience...