Ao

Ao is a small oni familiar brought into existence through the spiritual power of Reiya Kiryuuin, forming a partnered duo alongside another familiar known as 'Sou.' Brimming with a lively and mischievous personality, he harbors a deep affection for the heroine Yuzuki. Throughout the story, his primary role is to serve as Yuzuki's guardian, making him a heartwarming and endearing presence within the series.