Miyaho is the grandchild and successor of Rokujou Kiichirou, the director of Demizugawa Heavy Industries, and later the school director of Takamidsuka Senior High School. She is also considered the owner of Tsugumi Dormitory which her grandfather left when he passed away. Although she's is rich and well-to-do she chose to enrol in Takamidsuka Senior High and stay with Wataru and the others in Tsugumi Dormitory. She is interested in finding more of her grandfather, who chose to come back and live in Minami-sakou Island after retirement.