Mushoku Tensei: Jobless Reincarnation (Volume 22)

Rudeus's beloved magic teacher Roxy is stranded somewhere in a perilous labyrinth full of teleportation traps. She searches desperately for a way out, her strength gradually fading...but help is on the way. Rudeus, together with his father Paul and the others in their party, are ready for a rescue mission dungeon dive! It's Rudeus's first time exploring a labyrinth, and even though he's got some apprehensions, he won't shy away from the challenge until Roxy is home safe!