Ruri Aiba

Another main character of Sacred Seven. She is the daughter of a billionare noble family who were killed by a Darkstone. She created Aiba Foundation to combat against the Darkstone. She is a Lightstone that has the ability to turn a crystal into a Lightstone and insert it into Alma to control his true powers. She became chairman of Alma's school (where she heavily renovated the school) to keep in contact with Alma Tandouji. She has a older twin sister named Aoi Aiba who also survived the Darkstone aftermath, but was crystallized. Her whole foundation is occupied with all female maids.