Trying to find a manga

Hotchocolate December 5, 2020 11:15 pm

I don't remember much but it was a typical op reincarnation manga and they found out that the ml wasn't from the world 1, because he was a tiny kid and 2, because he could read an ancient book made by a previous king(?) for people that came from japan. I think he also made the king a chessboard?

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