After losing her hard-earned profits to student council member Aoi Mibuomi, a penniless Mary is given a chance to take it all back on just one condition: She must team up with Aoi to oust the student council president But in order to do so, she needs to first prove her skills in one of the academy's most popular events-the Coupling Party Will Mary be able to use her gambling prowess to survive this dirty game of cupid?