 If you liked
Tensei shitara Slime Datta Ken
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 ...then you might like
Yuukyuu no Gusha Asley no, Kenja no Susume: to, Pochi no Daibouken
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RPG world where there is magic, and the protagonist is super strong. It's really interesting to see the protagonist traveling aroud the world, as we readers get to known many places. The protagonist also get to make many different friends and is recognised by them. There is also talks about demon lords, which is still not totally clear in both mangas.