Ryouko married Sadao and became the stepmother of his son, Mikio. However, Mikio constantly shut himself away at home, leaving Ryouko unsure of how to approach him. One day, Ryouko discussed with Sadao the idea of sending Mikio to a rehabilitation facility, but upon overhearing their conversation, Mikio developed deep hatred toward her. After Sadao left for a business trip, Mikio attacked Ryouko by stripping her of her clothes and forcing her to live completely naked. He even involved his friends, humiliating and tormenting her in increasingly degrading ways. His actions stemmed not only from hatred but from profound psychological distortion.