Mizuki works as the No. 1 bunny girl at a night club. One day, a certain incident causes the owner of the club to change. At the same time, a woman named Ryo, who seems to be an acquaintance of the new owner, appears and says, "I'll be in charge of this club as No. 1."Ryo has a cheeky attitude, but Mizuki stands up to her. This leads to a sales competition between the two. The loser must swear absolute obedience to the winner... Ryo wins the sales competition, involving the club's fellow bunnies and customers, with a landslide victory. As promised, she orders Mizuki to become her slave.