Atsuko Shin is an 18-year-old teen who is still in high school. Despite her relatively young age, she has already experienced a great deal of trauma due to the abusive nature of her father, Rikishi Shin. Her younger sister, Yumemi, is 12 years old and is still attending elementary school. Their father, Rikishi, is a 45-year-old man who has become increasingly strict and controlling over the past few years, and he often forces Atsuko to engage in inappropriate behavior to satisfy his own desire.