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https://www.mangago.me/read-manga/the_lord_s_coins_aren_t_decreasing/
The Lord's coins aren't decreasing?
YOURE A SAINT!!! Thank you so much!!
So the mc has this like magic book that he can trade on with people from different universes. He is like the son of a duke or something but he dies and goes back in time, where he relearns swordsmanship and some other skills. Im also pretty sure only he can see the book too. I read this a while back and want to pick it up again