This facility is the only one in Japan that treats prisoners with ejaculation addiction. The inmates are those whose excessive sexual desires have disrupted their daily lives. This is a three-year record of the beautiful female prison guard O, who works there, from her days as a new recruit to the present. "I myself will provide sexual services for the inmates," she says, maintaining a professional attitude that never reveals her emotions while on duty. With prisoners who cannot control their impulsive sexual desires, the guards perform cowgirl sex with them in a cold, condescending manner, and never waver in their expressions, even when the prisoners orgasm as they please, including sudden penetration, thrusting, and fingering. Even when they climax, their expressions are not visible. Instead of making sounds when they feel pleasure, they blow the whistle.