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! 

The Eminence in Shadow: Shadow Gaiden Manga Ends : r/animereccped

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

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Manga - Volume 6, The Eminence in Shadow Wiki

The Eminence in Shadow

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Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden

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1 Chapter 40 - Kage no Jitsuryokusha ni Naritakute! Shadow Gaiden - MangaDex