The Biseikai group is funded by the dues and donations of more than 260 supporting members. The motto of the group is beauty for female models and sincerity for male models. Sakiko Yakuoji, the chairperson of the group, seduces the male models with the idea of having physical relations with them by any means necessary in order to win new members. This time, her target is 24-year-old Mioko, the eldest daughter of the Ureshino family, a wealthy family. She is a "woman who never smiles" and has never laughed...

(google translated)