Age: 12

Birthday: April 15

Sign: Aries

Favorite brand: Romance Kiss

Koharu applied to Four Star Academy together with her childhood friend Yume. Although they don't share the same class they do share the same room. They are very close friends despite their different personalities. Koharu has a delicate and quiet nature and Yume has a very energetic and curious nature.

Koharu was quickly taken in by the elegant and beautiful Yozora after she helped her when her glasses fell off. She began idolizing Yozora, which encouraged her to join the same class, the Moon Beauty class.