|Japanese name:||胡桃沢 梅|
Birthdate: 16th September
A girl who appears friendly and sweet to everyone around her, she has had a huge crush on Kazehaya since their first year of middle school; as a result, she understands his personality well, despite the fact they were never close friends. She dislikes her given name, Ume, because it sounds old-fashioned and prefers to be called her nickname, "Kurumi."
SpoilerShe is extremely jealous of Sawako, which led her to spread fake rumors of Sawako's only friends at the time, Yoshida and Yano, using Sawako's name. Kurumi does not attend the same class as Sawako or Kazehaya. She eventually confesses her love to Kazehaya, but receives an expected rejection. Because she is always surprised with Sawako's naiveté, Kurumi is able to be her true self in front of Sawako and regards her as a rival for Kazehaya's affection. Following Kazehaya's rejection, she becomes colder to her classmates, but is able to finally express her feelings and personality. Despite viewing Sawako as a love-rival, she will not hesitate to defend her honor and even gets angry at Miura Kento for saying unnecessary things to Sawako that had caused a rift between Sawako and Shota. She believes Sawako to be a worthy rival but has yelled at her and lectured her in terms of love, thus showing that, despite Ume's harsh personality she is deep down, a stubborn, clear minded young woman who won't stoop to unfair tricks to win a person's heart and gives credit where credit is due.