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I forgot the title of the story I used to read..
It's a guy who really wants to become a librarian and have the knowledge of everything that he got isekaid and became a librarian of a small library, when a customer enters they always misunderstood that the guy is a demon lord or like the guy is mysterious. And when a guy hands out a book in the customers perspective it's looks like eldritch horror but it's just actually ABC nursery rhymes..