Obsessive gambler Yumeko Jabami may know when to hold them and when to fold them, but knowing when to walk away and run has always eluded her. That's bad news at the insane Hyakkaou Private Academy, where students must gamble their fortunes, futures and lives in an endless series of competitions to determine who rules and who become slaves. Yumeko's razor-edged instincts, skills, and the devil's own luck have kept her going thus far, but when the ruthless Momobami clan arrives, intent on taking over the school, the stakes rise even higher while the intrigue, both in and out of the games, hits the deadliest level yet. To survive, Yumeko will have to adapt and make alliances with former enemies, knowing that every minute could result in a knife in her back as the nightmare continues in KAKEGURUI XX!