Hideaki Tsurukawa is a supporting character in the narrative, known primarily as a former classmate of the main protagonist, Ryu Yamada. He is a second-year student at Suzaku High School and is often seen wearing glasses. Tsurukawa is also a good friend of Meiko Otsuka, one of the seven witches in the school. Within the story, it was on his recommendation that Otsuka agreed to add Ryu Yamada as a partner for a group project or activity.

Tsurukawa's role in the story is closely tied to the activities of the Manga Club. During the Seven New Witches arc, he approaches a student council member to request that the Manga Club be allowed to switch their scheduled dates for the winter trip, as the club members are busy preparing their costumes for Comiket, a large gathering for fans of manga and anime. This request is made to Meiko Otsuka, who, despite her irritable response, is closely associated with him.

Regarding notable abilities, Tsurukawa is not naturally a witch and does not possess innate powers. However, after being kissed by Meiko Otsuka, the witch with the power of telepathy, he is able to temporarily use that ability. This follows the established rule in the series that a witch's power can be transferred to another person through a kiss. Information about his background beyond being a second-year student and a former classmate of Yamada is limited. His personality is not explored in depth, but his actions show him to be an active member of the Manga Club who participates in its events and coordination. There is no substantial information available regarding his personal character development over the course of the series or his motivations beyond his involvement with the club and his friendship with Otsuka.