Minami Kanto Women's Prison is a prison for the most dangerous criminals. The special wing where Kyoka works as the head prison officer houses Saki, who murdered her fiance and probation officer Michio. The two were classmates in high school and had a special relationship. Kyoka was convinced that Saki had killed Michio out of jealousy, and so she continued to subject Saki to the humiliating act of feeding her to the perverted prison officer Mikami. However, Saki still loved Kyoka...