A brave man trained by the worst demon king, unrivaled in the school of returnees from another world is a Manga/Manhwa/Manhua in (English/Raw) language, ACTION
series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.com fastest updating comic site. The Summary is
A brave man trained by the worst demon king, unrivaled in the school of returnees from another world
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