Mokugyoan (1967–) is a Japanese writer and researcher specializing in Kosuke Kindaichi, the fictional detective created by Seishi Yokomizo. Describing himself as a “student of Kosuke Kindaichi,” he established the website “Kindaichi Kosuke Hakubutsukan” in 1995 and has contributed articles on Yokomizo’s fiction and its screen adaptations under the name Akihiro Nishiguchi. His book “Kindaichi Kosuke-go Jiten” examines the novels, characters, films, television adaptations, and historical background of the series. In “Kindaichi Kosuke no Madori,” he uses textual clues, geography, and architectural history to reconstruct and analyze the buildings in which Kindaichi’s cases unfold.