Ruri Aiba

Driven by the tragic loss of her noble family to a Darkstone attack, this billionaire heiress established the Aiba Foundation to fight back against the monsters. As a powerful Lightstone, she possesses the unique ability to stabilize Alma’s true strength using specialized crystals. After taking over as chairman of Alma's school, she manages her vast estate-staffed entirely by female maids-while searching for a way to save her crystallized twin sister, Aoi.