監獄女王 ～ドS女看守達によるM男化調教～

The protagonist, Taketo Murakami, is charged with assault and sent to prison.
But the place he's sent to is a government-approved correctional facility called ‘Femdom.’ It's a terrifying place that advocates ‘female supremacy’ and rehabilitates (trains) men under this ideology. There, Taketo catches the attention of three female guards feared by all inmates. A capricious and selfish young lady, a former soldier guard captain, and a warden who never stops smiling... Under their relentless torture, his body and mind begin to change...