Ouji-sama

Makiyo is a classmate of Kaoruko and Chihaya. She is called "Ouji-sama" at Seio, which stands for "Prince", because she is popular. Her new friends Kaoruko and Kiyora are envied by other students for a while. Her emotional ups and downs are large, and she ignores even her closest friends while she is in a bad mood.

(Source: Wikipedia)