Sent to the dominatrix Kyō, the youngest instructor at Mistress Land, comes a disobedient slave who had been repeatedly sold and returned in the black market. His weaknesses and fears are thoroughly analyzed, and he undergoes rigorous retraining to become the perfect toy. Devising a special program, the elite instructor Kyō subjects him to 100 consecutive days of relentless torment focused on his greatest vulnerabilities. This method pushes slaves to the brink of tears, transforming them completely and creating a new trend within the facility.