Woodpecker Detective's Office (Kitsutsuki Tantei-dokoro)

[lilitu93]

Title: Woodpecker Detective's Office (啄木鳥探偵處, Kitsutsuki Tantei-dokoro)
Volumes: 1
Complete: Yes
Manga: Not that I know of
Anime: Yes
Publisher: Tokyo Sogensha

Description: It is the end of the Meiji Era. The genius poet Ishikawa Takuboku, who’s struggling financially, starts a detective business out of his lodging in response to a certain murder case. He calls it the Woodpecker Detective’s Office. "The ghosts of the Twelve-Story Tower in Asakusa," "the man-eating figure who wanders the streets on snowy nights"... Takuboku involves himself in one bizarre case after another with his hometown acquaintance, Kindaichi Kyosuke, as his assistant. (Copied from Crunchyroll)

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This is probably a long shot as it’s not a light novel but a regular mystery novel, but it recently had an anime adaption which I really enjoyed. The premise is famous Japanese authors solving mysteries. The character names should be familiar from Bungo Stray Dogs or Bungo to Alchemist, but it’s not supernatural or fantasy.