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[By the studio that brought you !] Minjun Kim, an ordinary high school senior in Korea, was suddenly...
Iffy addition to this list.
MC is a powerful Dark Mage that managed to stop the world war in the land of Isgard.
He returns to hunterverse Earth and find himself not getting the amenities he so sorely missed. In order to fulfil his desires, he enlists in the military where they have gaming PC rooms and access to gates, where he has access to dark energy.
Even without initially having his magic, he is still very strong.
Iffy additiond due to o"booby"ius fem ML but MC kinda weeb so who knows.