 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Maseki Gourmet: Mamono no Chikara wo Tabeta Ore wa Saikyou!
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1) Both main character died and were reincarnated in a new fantasy world.
2) Both main character are not recognized by their noble family and also are considered as "useless".
3) Both main character work hard in all that they do.
4) Both main character become stronger at a really fast pace.