The second of the three Mikadono sisters, known as the 'Three Emperors' at Saika Academy, and the ace of the school's physical education department. A beautiful high school girl who always wears her long red hair in a bun. Despite her small 150cm frame, she is a karate practitioner who overwhelms opponents with incredible strength and has won numerous medals. Her physical abilities are so superior that she has swept awards in various martial arts competitions since childhood. She has a gruff, charismatic personality and maintains a strict attitude toward both herself and others. However, she secretly tends to be shy and has a fondness for cute and bright things.

The third of the three Mikadono sisters, known as the 'Three Emperors' at Saika Academy, and the ace of the school's academic department. A beautiful high school girl with a unique two-tone short cut—blonde on top and green for the rest. She is a genius shogi player with an IQ over 180. She has won consecutive championships in Go and chess tournaments she occasionally enters, and possesses a brilliant mind, having led her team to victory as the youngest female representative in an international math competition.

The eldest of the three Mikadono sisters, known as the 'Three Emperors' at Saika Academy, and the ace of the school's performing arts department. A beautiful high school girl with short, deep purple hair. With her tall stature and low voice, she specializes in male roles in an all-female theater troupe, making her exceptionally popular among girls as a 'prince' figure.

The father of the three Mikadono sisters. A man of mystery.