father's lover

One weekend, Kenichi went out with his mother, leaving his father Toshio behind. However, Kenichi and his friends have to come home soon due to a mistake in their mother's schedule, and they end up seeing Toshio bringing his young mistress, Tsubaki, to his home. Shocked, the mother returns to her parents' home, and Kenichi questions Toshio, who tries not to meet Tsubaki. However, Tsubaki, who is not satisfied with this, suddenly storms into the house and attacks Kenichi, who greets him.