In this world, three supernatural races co-exist:
Crimson, Sapphire, and Amethyst.
Twins Rena and Kei reside in the Country of Humans: Angelis. Despite being the heirs to a prominent Crimson Family hailing from Lunaris, the country's social-political climate and danger forced their mother to hide them away as much as possible. After Rena is attacked by a Rogue Sapphire, a chain of events is thrust into motion. The twins are forced to abandon their home for the prominent school owned by their grandmother in Lunaris. Knowing nothing of this country or their family's influence, will Rena and Kei be able to keep their autonomy or follow the path laid out before them?