 If you liked
Kenja no Mago
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 ...then you might like
Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!
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Both main character goes from modern world to fantasy world. Both of the isekai anime are great because their story line is well divided. It's not rushed and they both have powerful main characters. If you like modern day ideas tossed into fantasy then this anime is just right for you.