The house where Asuka was born and raised was a very strange one... but that was the custom of the house. Each family member had physical relations as if it was the most natural thing in the world and lived a normal life. However, Asuka had already become a high school student and was not only physically but also mentally grown up, and she began to question the strange customs of her family. In the morning, her father made her give him a blowjob in front of her mother and brother, and when she took a bath with her father, they started having sex with her and ejaculated inside her. Then one night, Asuka finally made a decision...