 If you liked
Magi: Sinbad no Bouken (TV)
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 ...then you might like
Tensei shitara Slime Datta Ken
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Both series have similarities
- Have element of trade between regions
- Establish relations or peace between regions
- MC traveled another countries to negotiate with the owner / king for cooperation
- Build a trading country
- Have OP MC
- Bring enemy characters as partners or guards and make MC the master