My house is a little unusual. With my domineering father (Kouji) and my gentle and kind mother (Yuka), at first glance, we appear to be a normal family. My father often yells at my mother in a harsh tone. I often worried about my mother, but she seemed to accept my father's behavior. But in my house, there is a forbidden room that I am not even allowed to approach. Then, one day, just after midnight, I took a break from studying for an exam to go to the bathroom, and I heard a light and the sound of a moan coming from that room. Out of curiosity, I peeked in and it was my father's voice. My father, who had been spanking my mother during the day, was enjoying being spanked by my mother, who was clad in obscene underwear. From that day on, I experienced firsthand the reality that my mother was the ruler of this house...