In a certain city in Northern Kanto, Misao, a beautiful stepmother living with her husband and son, found herself at a loss after losing her house keys on her way home from shopping. Having held in the urge to urinate the entire way back, she frantically searched for her keys at the back door, but couldn't make it in time and wet herself right there. Her son, returning from school, happened to witness his stepmother's embarrassing accident... From that day on, she falls into a forbidden spiral of secret wetting training and incestuous depravity...
