Light novel series written by "Nigojū":[https://en.wikipedia.org/wiki/Nigoj%C5%AB], illustrated by  [[umibouzu_(niito)]].

Has manga and anime adaptations.

* "AniList":[https://anilist.co/anime/128712/Tantei-wa-mou-Shindeiru/]
探偵はもう、死んでいる。