Konoe Tsuruma is the class representative at Miryuin Private Academy. She has long black hair with slight drills at the ends, olive eyes, and often wears pink hair clips with a large bow. Her physique is notably well-endowed. Kind and gentle, Konoe harbors intense possessiveness towards Shougo Mikadono. Shyness prevents her from direct romantic confessions, leading her to use a voice-changing phone prototype created by her father. Through this device, she contacted Shougo while impersonating "Perin" from "Transforming Warrior Granberion," later claiming to be his sister. This stemmed from a childhood belief that becoming his sister would ensure they stayed together forever. She holds a strong romantic attachment to Shougo, sometimes expressing bold or suggestive thoughts about their relationship.

Konoe was Shougo's first friend upon his transfer to the academy and later revealed herself as his childhood friend. During their childhood, an accident occurred for which she felt responsible, resulting in Shougo's hospitalization and partial memory loss. This caused a rift between their families. Before the accident, they visited an amusement park where she took a photo of herself kissing his cheek; she later included this photo in a birthday gift to him alongside a cake and an action figure. Konoe is the illegitimate daughter of Kumagoro Mikadono, Shougo's father, initially presenting a potential barrier to romance. However, revelations confirmed Shougo was not Kumagoro's biological son, conceived instead via artificial insemination due to Kanoko Mikadono's infertility, nullifying their biological relation.

Her development involves confronting guilt over the childhood accident and reconciling her actions involving the deceptive phone calls. She participates in resolving corporate conspiracies targeting the Mikadono Group, including schemes by rivals using Yuzurina Houshou to undermine Shougo. Konoe has a pronounced fondness for creme puffs and other sweet foods. Her name, "Konoe," incorporates characters for "small," "heart," "from," and "branch," while "Tsuruma" combines "crane" and "real." Her birthday is April 13th.