Haruhi is the main heroine in the story. She is a mage in training and is seen as very skilled amongst her peers, who have been known to think of her as a genius when it comes to using magic. When she was younger, Yūma was able to use some magic in order to help her from some bullies which made her want to become a mage herself.
Her magic wand is named soprano (ソプラノ, Sopurano?), which owes its form from a trumpet that Haruhi used to play before she started to study magic. She harbours feelings for Yuma Kohinata. She was mistaken by Ibuki Shikimori to be the daughter of "that" woman (the woman who stole the Shikimori treasure) and even tried to control her to break the barrier that seals the treasure in the Shikimori Forest. In the end, she got together with Yuma when he was transferred to the Magic Section.