Hikaru Jomon first appeared in Power Instinct Matrimelee. Hikaru is a thirteen years old middle school student. Hikaru is mostly mistaken as a boy while in reality, she is a girl that has a tomboyish and very serious personality. She dislikes noisy people especially very feminine girls with high pitched voice. Hikaru attends the same school of the brothers Shintaro and Buntaro Kuno the ST. Lawrence Academy. Her ending in Power Instinct Matrimelee and some of the dialogues suggest that almost all characters think that she is a boy but in her apparition, in Goketsuji Ichizoku Matsuri Senzo Kuyou she has a special K.O. scene where her true gender is exposed.