Ignoring opposition from those around her, wife AIKA married a divorced man with children. Though she has a flashy appearance, she also possesses a homely, caring side. She built a good relationship with her stepson, and the three of them lived together happily. However, one day, AIKA accidentally caught sight of her stepson's crotch—a part of him she'd never paid attention to before. Mesmerized by his impressive cock, she began seeing him as a man, feeling attraction for the first time. From that moment on, a twisted, forbidden relationship slowly began to unfold between stepmother and stepson.