One year before the black-haired beauty Yumeko Jabami transferred to her school, Mary Saotome, a girl from an average family, enrolls as an honor student in Hyakkao Private Academy, where many young women from elite political and financial circles attend. But the school has a strict hierarchical system that is determined by gambling. Academic achievements or athletic prowess mean nothing here — gambling skills are what matter most. Students who fall into debt due to gambling must live their school lives as “house pets.” Can Mary Saotome carve out a future for herself at this academy ruled by gambling?

[Source: Netflix]