Even though they are parent and child, they are a man and a woman. When you open the door to the family bath, the scent of immorality is in the air! A father who returns home from a business trip is happy to see his loli busty daughter growing up, but what if an innocent cousin daughter joins in the father-daughter relationship where incest is the norm? Brother and sister also learn about sex under the guidance of their busty stepmother! The open-air bath where three families with their own circumstances gather together is truly a forbidden hot spring paradise!