Natsuhiko Kyogoku

is a Japanese mystery writer, who is a member of Ōsawa Office. He is a member of the Mystery Writers of Japan and the Honkaku Mystery Writers Club of Japan.

Three of his novels have been turned into feature films; ''Mōryō no Hako'', which won the 1996 Mystery Writers of Japan Award, was also made into an anime television series, as was Kosetsu Hyaku Monogatari, and his book ''Loups=Garous'' was adapted into an anime feature film. Vertical have published his debut novel as ''The Summer of the Ubume''. Provided by Wikipedia