Takao Hiyama

Takao Hiyama is the mysterious teacher at Yuki's school, and oh boy, he’s got a dark secret—he's on the list of local serial killers. Not much personality shines through since he only has four lines in the whole series, all focusing on his unexpected encounters with Yukiteru. Rocking the title of the Third diary owner, his "Killer" diary ominously tracks his next victim's whereabouts. Clad in a heavy trench coat, a hat, and a mask to keep his identity under wraps, he wields a hefty machete. With a name inspired by Vulcan, the Roman god of blacksmithing, he's as enigmatic as they come.