One of the members of the Matabi Academy Student Council, Kaiya deals with issues that arise around the academy. He is the owner of his cat Hissui and is a childhood friend of fellow council member Kotori Hasutani. He uses his powers to create unique "surfaces" that can be levitated.
Kaiya Yamamoto is created by Yuuji Iwahara; he has no information regarding any inspiration used by Iwahara to create him at this moment. He first appears in Cat Paradise volume 1. His Drama CD's Japanese voice actor is unknown.