Kumi Sagimiya

 ( Sagamiya Kumi) is a friend and classmate of Mitsuki Kouyama in the anime.

Anime

 * Is It Really a Hit?
 * I Want You to Hear It!
 * Run to the Audition
 * A Singer's Voice That Can't Be Heard
 * Meroko, All Alone
 * A Solo Performance—Live!
 * Please Dr. Wakaoji?
 * Is Mitsuki an Expert On Love?
 * The Illness Advances
 * An E-mail from Eichi?
 * A Present from Full Moon
 * Desire to Live
 * I Just Can't Tell Him
 * Day of Destiny
 * Searching For The Full Moon

Trivia

 * Episode 28 of the anime reveals that Kumi practices judo.