He is a very handsome student at Chiyuki's school who is very popular among the girls. He tends to be very suave and flirts a lot with the female students. As noted by Chiyuki, he also has a great sense of humor. Satsuki lives with his grandmother and has been able to gain a lot of her wisdom because of it. Also, like Tōya, he is not a human but in fact a werewolf. It is due to this that he constantly tries to appear as a normal person. If he didn't, he would always feel very insecure about him being a werewolf. He also seems to care a lot for Chiyuki and likes to protect (as well as flirt with) her to annoy Tōya.