Airi S. Granzchesta

Airi is Aika's mother and the general manager of Himeya Company. While serving as an undine, she was among the most respected and even got to mentor Akira. After retiring to run Himeya, she appointed Akira as Aika's mentor in preparation for having Aika become an undine and, eventually, inherit Himeya.

(Source: AriaCompany.net)