Children from influential families in politics and businesses attend the Hyakkaou Private Academy. There, the hierarchy are classified by a series of games. Students that win are on the ruling side and the ones who lose become slaves. One day, a mysterious girl, Yumeko Jabami, transfers to Hyakkaou. She looks pure and pretty, but she's actually a compulsive gambler and seeks out the thrill of taking calculated risks.

Minami Hamabeas Yumeko Jabami
Mahiro Takasugias Ryota Suzui
Aoi Morikawaas Meari Saotome
Taishi Nakagawaas Kaede Manyuda
Yurika Nakamuraas Sayaka Igarashi
Natsume Mitoas Runa Yomozuki
Ruka Matsudaas Itsuki Sumeragi
Matsumoto Kiyoas Nanami Tsubomi
Natsumi Okamotoas Yuriko Nishinotoin
Yuma Yamotoas Jun Kiwatari