Suginami Toubatsu Koumuin: Dungeon Kinmu no Hitobito - Vol. 1 Ch. 1 - Initial Launch

[MangaDex]

 

[CommieJohnTeh]

Looks like it yoinked the core setting from Solo Leveling.

 

[Robbini]

The whole tree entrances (if that's how they all look like) is pretty unusual, but the idea of dungeons isn't. Though if they're not afraid, it seems there's never been an outburst of monsters into their normal society. Though, this is the first time i've seen dungeons being a normal part of modern society for 50+ years, most are pretty short before the novel / manga starts, but they also tend to have more problems that mean people are more afraid of them.

 

[welcome2atlantis]

It's a bit difficult to understand, but still readable.
I wonder if they have orichalcum inside there. I want a mobile game console made of orichalcum. Or Adamantite, whichever is more durable when dropped and/or submerged in water... :'(

 

[cryum]

Just leaving the entrance like that? When there isn't actually someone in there to stop people from going in/out? Preeeeetty sure only japanese would be this level of complacent.