As compensation for covering up a medical malpractice incident, big-titted nurse Hikaru is forced to surrender herself to the perverted chairman. Her pure white uniform stained, exposed to lewd acts, she struggles between pain and pleasure, questioning her own identity. As her anus is touched, her reason gradually crumbles and her masochistic nature begins to awaken. Being degraded through nasal abuse causes her to lose further mental control, until her mind is completely dominated.