The War of Light and Gems

In the land of Arcadia there are two warring kingdoms. The kingdoms of Phantasm and Destiem; Darkness and light.
Kaya Tourmaline goes to a neutral school where the groups are divided by kingdoms; The Gems and The Lights. Kaya is a Gem who is pretending to be a Light. She secretly fights The dark ideals of the Gems while being engaged to the heir of the Phantasm throne.