The Land of Wisteria, divided between twenty-four kingdoms and ruled chaotically... War - a world full of hunger and crime... Irithel, one of the victims of the war between the kingdoms - lost both her mother and brother at a young age and trained herself for years to become a master fighter in order to avenge the suffering she suffered. became like that. After years of preparation, Irithel's plan is simple: She will infiltrate the Royal School, where twenty-four heirs from twenty-four kingdoms are educated - and stand against the kingdom that took her family from her. While everything is going well, Irithel's plans are thwarted by a mysterious killer at the school. One of the twenty-four heirs he was trapped with - he decided to kill them one by one and made it a game, carrying out one after another. The only way to get rid of the game is to find out who the assassin is who set up this game.