The Kingdoms of Ruin - MangaDex

Due to the Gear Expansion, witches who had been friends with the people become unnecessary. Humans, who were afraid of unscientific power, begin a witch hunt… And a human boy who has his beloved witch killed becomes the “Wizard of vengeance”.

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The Kingdoms of Ruin - MangaDex

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ART] A Promise, The Kingdoms of Ruin, colouring by me : r/manga