『Kaya』

A Zashiki-warashi who lives at and looks after Yuto's grandparents' house. She is very fond of Himari, as she once lived with her when Yuto's grandparents were alive, but does not like Yuto due to the fact that she is very jealous of him and blames him for Himari leaving her. She is usually seen either cleaning up the house or reading books and scrolls in the storehouse. Kaya once provided Shizuku with the Amakawa's family records, which held information about the family itself and Himari's ancestors, at the latter's request, and(in the anime only) provided Yuto and Rinko brief information about Shuten-dōji and Tama's origins. She can generate a force field around herself and other people in her vicinity to repel enemy attacks. Starting from chapter 56, she joins the fight against Tama in the appearance of a ninja.