Hei no Naka no Biyoushitsu

In the women's prison, there is a beauty salon that is open to the general public. If you make an appointment, a prisoner will cut your hair for you. The minds of the customers are filled with anxiety about the crime the hairdresser has committed, but the blue sky painted on the walls of the salon always manage to calm them down. Spending time with the hairdresser is enjoyable, but why did she become a criminal in the first place?