A certain city in northern Kanto. Misao, a beautiful mother-in-law who lives with her husband and son, lost her house key one day on her way home from shopping and was at a loss. At that time, he had been holding back the urge to urinate the entire time, so he hurriedly looked for his keys at the back door, but he couldn't find it in time and ended up ``incontinence'' and ``wetting himself'' on the spot. My son happened to come home from school and witnessed his mother-in-law's embarrassing peeing... From that day on, the stepmother falls into a forbidden drama of peeing, training, and incest that she cannot tell anyone...
