The fourth volume of the light novel The Eminence in Shadow ( Kage no Jitsuryokusha ni Naritakute! ) confirmed that the work will receive an anime adaptation.
Synopsis
Many admire heroes and villains, but a certain young man admired those who acted in the shadows. After spending his entire life hiding his true strength and acting as just another character, he reincarnated in a new world full of magic and conquered absolute power! Sid creates a fake organization with the goal of acting as a background character, but which works behind the scenes to confront a secret cult that stands in his way.
Aizawa launched the light novel The Eminence in Shadow Shosetsuka ni Naro website in May 2018, and Kadokawa began publishing the story in physical volumes with art by Touzai in November 2018. Additionally, Anri Sakano launched a manga adaptation in Comp Ace in December 2018.
Finally, Seta U launched a spinoff titled Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden na Comp Ace in 2019.
Source: ANN