At Aurelia Academy, students rise and fall through a brutal gambling-based ranking system ruled by the elite Crown Ten. Keiko Kasamoto enters as an unknown transfer student, quietly climbing the ranks with unmatched skill and a fearless love for high-stakes games. But behind her calm smile lies a hidden truth: her parents were once part of the Crown Ten—and were killed by the system she is now entering. To uncover what really happened, Keiko must gamble her way to the very top.