Kota was a lazy good-for-nothing man living alone with his mother, Yuri. He harbored romantic feelings toward his young and beautiful mother as a woman. One day, his older brother Kenichi, who had moved out to work, returned home for a visit. That night, Kota witnessed Kenichi and Yuri secretly meeting. He saw his mother being passionately caressed all over, her vaginal lips licked intensely before penetration. Seeing his own mother climaxing from his brother's cock, Kota was consumed by deep jealousy and ran out of the house.