Seeing his daughter masturbating, the father and older brother enthusiastically "helped."

Discovering his teenage daughter masturbating in her bedroom, knowing she doesn't have a boyfriend, the father found a way to "help", and the older brother, upon learning about it, was just as eager to assist, supporting his father. Seeing his daughter masturbating, the father and brother enthusiastically "helping" is a taboo movie by Hibino studio, starring Mao Hamasaki, depicting the incestuous relationship between the twenty-year-old daughter continuously being "abused" by her father and brother. After being caught masturbating by her father, it seems that Hamasaki also wants to have sex with him and plans to only have sex with her father, but unexpectedly, while in the act with him, the brother discovers..

. Not wanting her mother to find out about her incestuous relationship with her father, the girl decides to involve her brother. This secret is known only to the three of them, and no one else...