The eldest daughter of the Mikado family. A 3rd-year student in the Performing Arts department at Saika Academy. She is the star 'otokoyaku' (male role player) in an all-female opera troupe. She has a boyish appearance, characterized by her blue-tinted pixie cut and tall stature. First person: I (soft, boyish). A genius at acting, she effortlessly handles difficult roles with her superior acting and singing skills, even reviving roles once thought impossible to restage, earning high praise internationally. She is extremely popular with women both inside and outside the academy. While she has more pride than most, she is also a hard worker, once trying to force herself up to practice for a stage play even while running a fever. She is a very picky eater, hating bell peppers, shiitake mushrooms, eggplants, bitter melons, and wood ear mushrooms. Initially, she looked down on Yuu when they started living together, but she gradually grew closer to him.

The second daughter of the Mikado family. A 2nd-year student in the Physical Education department at Saika Academy. A karateka. Characterized by her long hair tied in buns. First person: I (casual, feminine). A master of karate kumite, she has extremely high physical ability despite her small stature of about 150cm, winning numerous martial arts competitions. There is a lingering rumor that during a middle school field trip for mountain vegetable picking, she defeated a bear with a single blow. She is tomboyish and her language is a bit rough, but she is strict with herself and others, serious, and never skimps on effort, doing independent training in the family dojo. As an athlete, she is also mindful of nutritional balance in her diet. In truth, she is interested in cute clothes and accessories appropriate for her age, but she avoids them, believing they 'don't suit her character.'

The third daughter of the Mikado family. A 2nd-year student in the Advanced Academic department at Saika Academy. A professional shogi player. Characterized by messy green short hair, a snaggletooth, and a large bust. First person: I (regional/informal), ending sentences with '-ssu'. She has a sweet tooth. Possessing a brilliant mind with an IQ over 180, she is active as a female professional shogi player, and the shogi world has high expectations for her future. She has won competitions not only in shogi but also in Go and chess, and led her team to victory as the youngest female representative in an international mathematics contest. While she excels in all areas of study, she is poor at sports. She has a slightly mischievous personality. She doesn't fit in well at school and is usually alone. She actually has a soft spot for cats.

Unlike his mother, who excelled in academics, sports, and the arts, he is an ordinary person with no talent in any of those fields. The only thing he inherited was her good looks. However, he is skilled at general housework like cooking and cleaning. He handles all the chores for the Mikado family, wearing an apron with a bear print on the chest while working. He is a bit of a klutz but a hard worker with exceptional domestic skills.