Aika, who remarried with Kazuhiko and became the stepmother of his grown son Naoya. Naoya, who is shy around strangers, does not open up to Aika no matter how much she tries to talk to him. One day, Aika sees Naoya being bullied by a classmate and goes to his room. When she brings up the classmate, Naoya, enraged, rapes Aika… An unforgivable secret event. However, Naoya tells his bad friends about his relationship with his stepmother, and Aika's wish for happiness is in vain, even involving her son's friends...
