 If you liked
Log Horizon
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 ...then you might like
Overlord IV
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These 2 anime has similar situation in which both the protagonist and others are stuck in a rpg game with no knowledge on returning to the real world. However, in Overlord the main protagonist is the only current known player who's stuck while in log horizon many players who were logged on at the time was transported into the game. Also, both protagonist are overpowered.