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Uehara Tsubasa is a tough, tomboyish teen nicknamed the "Demon Princess" at her school, while her twin sister, Sonoda Arisa, seems to live a perfect life—popular, gentle, and adored by all. Separated for years after their parents’ divorce, the sisters stay connected through letters until a long-awaited reunion takes a dark turn when Arisa attempts suicide, leaving her in a coma. Determined to uncover the truth, Tsubasa takes Arisa’s place at school, diving into a web of secrets involving a mysterious figure known as the "King" who grants dangerous wishes to Arisa’s classmates.