 If you liked
Tate no Yuusha no Nariagari
|
 ...then you might like
Tensei shitara Slime Datta Ken
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1) Both main character are transported/reincarned in another world
2) Both stories are set in a fantasy world
3) Both LNs have enjoyable characters
4) Both stories have good lore
5) Both main characters have his own lands and build a nation
6) Both main character rise really fast (not more spoiler for enjoy more of the LN)