Muraki Harukaze is a private detective who arrives on the screw-shaped island of Nejigashima from Japan. He is introduced as a supporting character in the anime series Heybot! His primary motivation is to obtain the ancient and dangerous document known as the Nejigashima Chronicle, a book that holds great power or forbidden knowledge. Throughout his search, he enlists the help of the main protagonists, Nejiru and Heybot, as well as their allies. With their assistance, he successfully acquires the chronicle, but upon reading its contents, he suffers a severe mental breakdown, indicating that the chronicle’s information is overwhelming or corrupting. This breakdown marks a defining moment in his role within the story, as it underscores the perilous nature of the chronicle and the limits of human endurance. Muraki Harukaze has a daughter named Heimi, though her presence in the series is limited. In a later episode, he reappears as a private investigator on Screw Island, looking into the disappearance of an eccentric billionaire who was last seen with the Screwcronomicon, a book that may be connected to the same dangerous lore. His personality is that of a determined, professional detective who becomes increasingly obsessive in his pursuit of knowledge, ultimately leading to his downfall. He does not possess any special combat or supernatural abilities; his primary skill is his investigative reasoning. His development is largely confined to a single story arc, where his quest for the chronicle and its consequences illustrate the risks of seeking forbidden truths. His relationship with Nejiru and the others is cooperative, as they aid him in his mission before his mental collapse.