Since the bookmark wipeout I've been slowly rebuilding my reading lists, and I remember reading a manga about a middle-aged guy called Hiro that was isekai'd (summoned maybe?) to another world, and he's so OP he has to limit himself to something like 10% of his power. He has a fairy sidekick, and I think he has an adventurer pal but I'm not sure if I'm remembering that correctly. He also wears a suit I think.
Does this ring any bells for anyone?
Hey, you know it has the word "wholesome" in the title right??? This is becoming the opposite!