She is a spirit that was born from the rumors and legends of the mother of all spirits. As such, she is considered their mother and ruler.

Reno epitomizes kindness and honesty, her amiability welcoming connection. She radiates transparency, engendering trust through her candid communication. Her protective nature emerges against threats to her home and loved ones, revealing a resolute defender. Reno's loyalty extends beyond space, encompassing emotions and memories. A genuine and strong individual, she seamlessly shifts between compassionate friend and fierce guardian, embodying authenticity in a multifaceted personality.

Accompanied by Shin, Reno eventually arrived at the Demon Castle Delsgade, where she met with the Goddess of Creation Militia, the Hero Kanon, and Anos himself. The four collaborated to cast Beno Ievun, using Anos' life force as magic power to create magical walls that would isolate the four races until their hatred faded away. After Anos' sacrifice, she traveled back with Shin but to Aharthern.

(Source: Maou Gakuin Wiki)