The Mikadono sisters, young teenage girl, who are very intelligent and strong in their respective fields. Kazuki being an attractive girl, cold, classy and strongly resembling a boy, she is an Opera Star, with dark blue hair and golden eyes. Niko is a girl with orange hair with yellowish highlights, golden eyes, gifted in karate and powerful. Miwa, a girl with apple green hair and a yellow lock, golden eyes, professional shogi player. Known as 'The Emperor' in their high school.