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

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled…. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.>

Demon King, Retry! (WN) - Novel Updates

Web Novel, The Eminence in Shadow Wiki

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where in the novel is chapter 21 in the manga? : r/TheEminenceInShadow

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

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The Eminence In Shadow - To Be a Power in the Shadows! - Kage no Jitsuryokusha ni Naritakute!