Reiko Kanazuki is a Class 1-D student at Ouran Academy, and a member of the Black Magic Club. She has a crush on Honey, and says that he stole her "soul" (rather than her heart). For that reason, she wants to "curse" him with a love spell. However, due to her shyness and spooky personality, the Host Club initially gets the wrong impression that she is out to do Honey harm. After some words from Honey, Reiko decides to try to overcome her shyness and back off on the curses a little. From then on, she becomes a regular at the Host Club.
In Chapter 71 of the manga, Reiko is seen eating cake in the cafeteria with Honey outside of Host Club hours, hinting at a continued relationship which is later confirmed. In April 2011, a short story special chapter in LaLa Magazine was written. Bisco Hatori wrote what happens to each character a few years into the future. It was revealed the Reiko and Honey eventually got married.
She's the second member of the Black Magic Club to be named, after Nekozawa.
Reiko Kanazuki first developed romantic feelings towards Honey when she tripped over Usa-Chan in the hallway and he offered her his hand, the first nice thing anybody had done for her in a while. She then became obsessed with "cursing" Honey and casting cursers and spells on him to "capture his soul" as she believes he has captured her's. At the beginning, Honey is a bit scared, but as Kanazuki starts following him around and spending more time with him, he realizes that Kanazuki casting spells and curses is her own way of communicating, as she is not very sociable and doesn't know how to express her feelings otherwise. Honey, before discovering this, had never been rude or mean to Kanazuki, but always been polite and nice, causing her to like him even more. He also realizes that Kanazuki doesn't have many friends, which may add to her inabilty to communicate any other way. He explains to Kanazuki, who has an obvious crush on him, that the easier way to express her feelings and "capture anothers soul" is by talking to them, and that if she spoke more about her likes and dislikes, he would want to know more about her. He says he likes people who put in the effort, and so Kanazuki starts to attend Host Club and the two get to know each other better. No official romantic events have happened between the two, as they are polar opposites, but their relationship escalated when Honey realized they had something in common - they both have a somewhat "unhealthy" hobby that they like too much to give up, and need to find a way to manage better (Kanazuki's being black magic, Honey's being cake and sweets.). In the future, shown in a special chapter of the manga, they are the first of the host club to marry.