Saku Ezomori

犹守 朔
Saku is the older brother of Nozomu who makes his first appearance in the second volume of the novels like his sister he is a wolf deity. He usually drives a motorcycle around town and he later reveals that he is in love with Chizuru resulting in him putting a bracelet on Kouta to stop him from doing anything perverted with Chizuru the bracelet is taken off a few days later. Source: Wikipedia.