Dungeon Dive: Aim for the Deepest Level Vol. 1 (manga)

A compelling isekai fantasy adventure based on the light novels in Japan!

When Aikawa Kanami is suddenly transported to another dimension, he's thrust into a world of magic and monsters. In this strange land, adventurers band together to try and clear the Dungeon, a mysterious labyrinth with a hundred levels. Legend says that if you reach the hundredth level, any wish you have will be granted.

All Kanami wants is to get back home to his ill little sister, but does a level 1 newb like him even stand a chance?