 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Kumo desu ga, Nani ka?
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1) Both main character died and were reincarnated in a fantasy world
2) Both main character started as the "weakest"
3) Both main character go trought several bloody circumstances, but keep a stoic behavior
4) Both main character get to become the strongest in the world.