In a future where humanity's birth rate has plummeted to zero, the rapid rise of passive men has thrown society into chaos. Amid this crisis, attention turns to a potent virility hormone called "Bokkitrin" found in female urine. A new system is introduced leveraging this hormone, and in medical prisons, inmates are required to submit sperm instead of serving traditional sentences. Female prison guards use their urine to induce erections in prisoners' penises, after which their sperm is extracted. Furthermore, men who refuse to provide sperm are deemed unpatriotic, forcibly restrained, and have their penises made erect with female officers' urine before their sperm is seized. Within this twisted social structure, the conflict between human instinct and institutional control unfolds.