 If you liked
Shachou, Battle no Jikan desu!
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 ...then you might like
Mob kara Hajimaru Tansaku Eiyuutan
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both are modern world where fantasy dungeon opened and became part of daily life
both have similar art style
one a nobody's way to a exploration hero focuses on the mc trying to become strong white
shachibato follow a young president of a guild tasked with harvesting material from dungeons