Saku Ezomori

Voiced by: Yuto Kazama (Japanese), Grant George (English)

Saku is the older brother of Nozomu Ezomori who makes his first appearance in the second volume of the novel; and like his sister, he is a wolf spirit, He usually drives a motorcycle around town, and he later reveals that is in love with Chizuru Minamoto, resulting in him putting a bracelet on Kouta Oyamada to stop him from doing anything perverted with Chizuru. The bracelet is taken off a few days later when Kouta and Chizuru defeat him in their fused form.