I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too, Vol. 4 (manga) (I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too (manga))
“Book Descriptions: While exploring the Weald, Yuuya Tenjou happens upon a mysterious cave. Inside, he finds a document penned by a legendary sage that he uses to inherit their mana pathways, gaining exceptional skills and all-powerful magic. Now there’s nothing that can stop Yuuya—not even the laws of nature! ” DRIVE
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