Nagi is a manager who is good at her job and is well-liked by her subordinates. She sometimes disciplines her subordinates strictly, but she has a secret that she can never tell anyone at work. "Haa... Haa... Welcome back, big sister." When she gets home, one of her subordinates dance She is greeted by a collar around her neck... The relationship between boss and subordinate is reversed at night and day. During the day, she is a serious elite and an ordinary employee. At night, she is a perverted female slave and a sadistic lesbian. The SM relationship between the two sinks into endless pleasure...