Sunemi Koganeyama, a recurring character, serves as both classmate and neighbor to Eri Kasuga. Hailing from a wealthy family, she frequently boasts about her affluence and exhibits spoiled tendencies. Her appearance is marked by a distinctive fox-like face. Within their social circle, Sunemi maintains a friendship with Eri yet consistently attempts to overshadow her, efforts typically thwarted by Eri's grounded modesty. Sunemi also harbors a romantic fixation on Uchiki Sho, establishing a love triangle with Eri that fuels a persistent rivalry. Her character role and established traits remain consistent throughout the series and related media, without significant personal evolution or expansion of her background.