The Eminence in Shadow: Shadow Gaiden Manga

Cid is a boy who reincarnated in another world, and decided to enjoy a scenario of being "the eminence in shadow, someone who meddles with the story from the shadows, and exhibits his true power in secrecy". Thus unfolds the story of him and the secret organization he leads—shadow garden—as well their their pleasant friends! 
Cid is a boy who reincarnated in another world, and decided to enjoy a scenario of being "the eminence in shadow, someone who meddles with the story from the shadows, and exhibits his true power in secrecy". Thus unfolds the story of him and the secret organization he leads—shadow garden—as well their their pleasant friends! 

Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden - chapter 1 - Kissmanga

The Eminence in Shadow Vol. 7 - Tokyo Otaku Mode (TOM)

Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden Vol.5 Ch.35 Page 32 - Mangago

Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden Vol.5 Ch.30 Page 1 - Mangago

665, The Eminence in Shadow Wiki

The Eminence in Shadow Episode 3 Preview Released

The Eminence in Shadow Chapter 41 - The Eminence In Shadow Manga Online

The Eminence in Shadow Vol. 10 - Tokyo Otaku Mode (TOM)

Shadow Gaiden Chapter 16 – Readkomik

Read Kage No Jitsuryokusha Ni Naritakute! Shadow Gaiden Chapter 43 - Manganelo

The Eminence in Shadow Anime Announces Seven Shades' Cast - News - Anime News Network

To Be a Power in the Shadows! (WN) - Novel Updates

New kage jitsu gaiden chapter just dropped : r/TheEminenceInShadow

Read Kage No Jitsuryokusha Ni Naritakute! Shadow Gaiden Chapter 40 - Mangadex

Kagejitsu Shadow Gaiden Chapter 43 : r/TheEminenceInShadow