New nurse Ayumi is a young caregiver just starting her first year at a certain general hospital. However, after a minor mistake, she is captured by the hospital director, who suspects she's formed a relationship with a patient. Bound at the wrists, she is imprisoned within the hospital premises. Though resisting at first, Ayumi gradually succumbs to his depraved training, climaxing uncontrollably as she transforms into a new version of herself. Throughout this process, sweet words and forceful domination slowly take hold of her mind.