無敵の未来大作戦

"Seikon" or Holy Marriage, a new form of marriage that will reverse the declining birthrate. Chosen "Saints" (*Super duper rich people) gain the right to polygamy! Eiko Akira who comes from a poor household and seeks security becomes interested in the newly appointed "saint" at school, the princely Iida! But she's not the only one vying for his attention...!