A Female Jailhouse (2005)

Chie escapes to an empty villa in the mountains with her boyfriend Shimamoto, from whom she has stolen a large sum of money. However, she is unable to escape the clutches of the police, and while Shimamoto escapes, she is sent to prison alone. Tatsuko and Kaori are in the shared cell with her. Not liking Chie's cold attitude, Tatsuko and the others start bullying her. A few months later, her younger sister Izumi comes to visit Chie. She says she needs money for their sick mother, and asks her to tell them where the money is hidden...