After their noble household falls into ruin, Ayame, Ruri, and Miki are handed over to a professional trainer to be transformed into obedient slaves. The Master begins his rigorous training, using pleasure and discipline to break their will. While Ruri quickly succumbs, the spirited Miki attempts to fake her submission, only to be thoroughly dominated and brought under the Master's absolute control.
Ruri undergoes rigorous training under her Master to overcome her inhibitions and embrace her role as a slave. After struggling with the pressure to match her family's progress, she is ultimately asked to become the Master's personal slave, fully committing herself to his desires. As their bond deepens, hints of a larger conspiracy involving the systematic training of slaves for a mysterious household begin to emerge.