Mio Tennoji is not a well know character, but appears in one episode as a friend of Shuuji's (Harima's little brother). She is seen walking around the fair with him, and talked to Yakumo about her crush on him when they are separated. At the end of the episode she is featured it, she talks with Shuuji about their older brothers, Shuuji having Harima and Mio having Tennoji.