Just few months ago, you transferred into Hyakkaou Private Academy. Where social statuses are more important that studies of schoolwork.

Everyone in school gamble their way to power and fame, and people who lost in gambling will have to pay to the winner. If the lower doesn’t have enough money to pay then they’ll have to act as a slave for the winner for the rest of the school years until they pay their debt.

One day, Momobami Ririka, the vice student council president received a order from Momobami Kirari (the student council president) who is also secretly her younger twin sister to gamble with you and take your role out of the academy at once.