Kurumu Kurono is a busty succubus attending Yokai Academy. Her outfit consists of a tight-fitting yellow sweater-vest with a red bowtie over a long-sleeved dress shirt and baggy socks which are reminiscient of the kogal fashion amongst Japanese schoolgirls (in later chapters, she changes to a short-sleeved version of her outfit with a red ribbon tied in a bow). She was initially a rival to Moka, being jealous of her popularity surpassing her own, and attempted to seduce Tsukune and the male student body to find her "Mate of Fate", as her kind is near the brink of extinction. After she was badly beaten during a fight with Inner Moka, Tsukune persuades Inner Moka to spare her, and as a result, Kurumu not only became friends with the pair, but also becomes infatuated with Tsukune, and makes a decision that he will be her "Mate of Fate".
A running gag in both series is when she uses her characteristically large breasts (said to be a G-cup according to her in an omake) to seduce Tsukune, which, more often than not, makes his nose bleed and causes him to suffocate. She also attempts to use baked sweets laced with love potions to secure his affections, though they never seem to reach him. Ironically, Kurumu has a serious weakness for sweets as revealed in an omake, where she once ate poisoned cookies she made and planned to give to Moka. Kurumu's mother is Ageha Kurono, who appears during the start of the school festival under the belief that Tsukune is her daughter's fiancée. Mizore's nickname for Kurumu is "Bazooka Girl".
Voiced by: Misato Fukuen (Japanese), Brina Palencia (English)