Arisa lives happily with her husband, Masashi. One afternoon, Masashi's father, Nobuo, suddenly appears, marking their first reunion in two years. Arisa is haunted by the nightmare of her forbidden affair with Nobuo. Learning that Masashi will be home late, Nobuo demands they rekindle their relationship. Desperate to protect her marriage, Arisa resists fiercely, yet she is gradually overwhelmed by Nobuo's relentless advances. Torn between loyalty and desire, what choice will Arisa be forced to make to preserve her bond with her husband?