OVA
Description
Haruma Yamazaki is the former president of the student council at the school where the story takes place. Standing at 178 centimeters tall with teal hair and blue eyes behind his glasses, he cuts a distinctive figure. His birthday is April 1st, making his zodiac sign Aries, and his blood type is AB.

On the surface, Haruma typically presents himself as carefree, laid-back, and somewhat of a womanizer. He often appears aloof or unconcerned with serious matters. However, this exterior is deceptive, as he is actually extremely cunning, sharp, and strategic. Toranosuke Miyamura describes him as a tanuki, a creature known in Japanese folklore for being sly and mischievous, highlighting his nature as someone difficult to read and highly ingenious. His personal philosophy is that life is a repetition of destruction and rebuilding. This belief is reflected in his lifelong hobby of completing jigsaw puzzles, which he then proceeds to break apart after finishing them.

In the story's chronology, one year prior to the main events, Haruma was a member of the Supernatural Phenomena Research Club alongside Leona Miyamura. Together, they investigated the mysteries of the witches within the school. Their research led them to Rika Saionji, who was the seventh witch. Rika revealed her nature to them, but when she attempted to erase their memories, Haruma helped Leona escape to preserve her memories of their time together, staying behind and allowing his own memories to be erased. Following this incident, he became the Student Council President with Rika's support and also served as her spotter. As a spotter, he possessed the ability to locate any person with magical abilities in the school, seeing them as dots on a mental map. He also obtained from Rika comprehensive information about all the witches and their powers.

Throughout the main storyline, Haruma acts as an initial antagonist and a chessmaster, manipulating events and using Shinichi Tamaki to help neutralize the abilities of various witches. He presents the search for the seventh witch as a test to determine his successor as student council president, using this to further his own goals of maintaining the masquerade surrounding the witches. His actions are driven by a deep-seated pain from his repressed memories of Leona, a condition known as wistful amnesia, which causes him to feel a powerful but unexplainable surge of emotion when he sees her again.

Upon realizing his memories have been tampered with, he allows Ryuu Yamada and his friends to perform a ceremony that restores them. After recovering his past, he undergoes a heel-face turn, ceases to be an antagonist, and steps down from his position as president, ceding the role to Toranosuke Miyamura. His primary motivation throughout his time as president was to protect Leona, and near the end of his school life, he confesses his romantic feelings for her at the graduation ceremony, though she turns him down.

Following his graduation, Haruma continues to maintain contact with the main group, including Ryuu Yamada, Toranosuke Miyamura, and Shinichi Tamaki, often offering them advice. In college, his carefree attitude leads him to repeat two years, making him the junior of his former friends for a time. In the epilogue set ten years later, he is shown working at an advertising agency and remains close with his old friends, even organizing mahjong tournaments at his home. In the live-action drama adaptation, he is portrayed with a distinct ability to absorb a witch's power by kissing them.
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