 If you liked
Digimon Adventure
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 ...then you might like
Log Horizon
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Perhaps an overlooked series but the classic Digimon and Log Horizon both takes place in a virtual/digital realm surrounded by fantasy atmosphere.
The main characters are part of a group as they fight for survival.
There are mechanics explained in both series throughout its plot. Digimon Adventures offers more of an adventurous setting while Log Horizon focuses other aspects of the virtual realm such as economics. However, both series relates to its technological realm that the characters are a part of.