A father and mother are perverted. On a crowded train, the female high school student the pervert is having sex with turns out to be their daughter! However, in a fit of excitement, the pervert engages in forbidden incest. (AP-151)

A man on a crowded train groped a female high school student who was pressed against him. However, he was shocked when he saw her face! The victim was his daughter! He tried to calm himself down, but seeing his daughter's beautiful figure, he couldn't resist engaging in forbidden incest!