A young and beautiful female instructor. While she has a physical relationship with a guard, she also serves as a spy for the warden. She disguises herself as a prisoner and sneaks into the cells, cleverly finding out the prisoners' secrets and reporting them to the warden. As a result, a thought criminal commits suicide, and a colleague who became involved in lesbian relations with a female prisoner is punished.

• Wakamatsu Production
• Shintoho Pictures
• Naomi Oka
• Yuri Izumi
• Hitomi Kawai
• Yuki Kitazawa
• Masami Arisawa
• Kayoko Sugi
• Hiroshi Imaizumi
• Shirō Shimomoto