Nurse Anna Komukai mercilessly torments mentally ill patients, treating them like animals—drawing graffiti on their faces, forcing them to lick like devoted servant dogs, and making them eat food dropped on the floor. By night, her demeanor completely transforms as she becomes a sexual slave, guiding the patients into wild, carnal pleasures. Trapped within the confined space of a locked psychiatric ward, she exudes the authority of a dominatrix while simultaneously enforcing their role as slaves. This eerie, depraved existence of sexual slavery unfolds a twisted, inverted relationship that blurs the lines between caregiver and patient, dominance and submission.