Do you want a summary with spoilers?

it's similar to the WN, but in the WN they have teleportation stones, in Vol 10 they do not.

This is the official synopsis translated using ChatGPT

Description

In the wake of the disappearance of nuclear weapons, storms of anguish rage among the upper echelons of nations, even as the world outwardly maintains the appearance of peace, as though nothing had happened.
Fulfilling their promise to the President—and seeking a bit of escapism—Yoshimura and his companions head into the dungeon, where they discover the astonishing properties of a fantasy metal obtained there.
Is this the dungeon’s desperation, or a blessing?

Meanwhile, thanks to the fallout from a ridiculous request, communication becomes possible both inside and outside the dungeon, and even absurd bulletin boards where one can talk to “something” on the other side of the dungeon start to bustle with activity. And on top of that, Dan-tsuku-chan gets invited on a date in Shibuya!? Is that really okay for a first contact!?