The beautiful girl's name is Momo. She is brought to an institution to be adopted by three elderly brothers, but waiting for her are outrageously lewd old men. They constantly scold and taunt Momo, treating her as their plaything. Yet Momo remains pure and obedient, never resisting their demands—because she has already been trained by a man from the facility to be submissive, conditioned to serve as a sex toy. Punishments, forced masturbation, and nighttime ● acts gradually escalate into an outrageous gangbang involving all three brothers. These aged men heap shameless acts upon the innocent young body, turning her into nothing more than a toy for their desires...!