Mai, the daughter of a wealthy family in a certain prefecture, is a female student attending a school for girls. She has grown up in a very wealthy private life, knowing neither filth nor hardship. One day, Mai is attacked and kidnapped by the cleaners of the luxury apartment where she lives, Saji and Tokoma. The two men, who have always harbored a grudge against Mai, set their sights on her to get revenge. They also offer Mai to the Yakuza who owe them money...