He was actually a "hero" summoned by a sacred magic. Also summoned was a Japanese young man.
Unlike the spiritual nature of everything in this world, he actually has no magic power.
He is immune to many spells and can resist their harm, but he cannot block actual physical attacks.
As a result, he could only rely on his repair and manufacturing skills to survive in this other world.
Another Japanese man, with his modern knowledge of people's livelihood and economics, helped the Ennis Kingdom, which was trapped in a global war, to revive.
Why did the gods summon these two "holy heroes"? Coming to this world based on magic?