Disciple of the Lich: Or How I Was Cursed by the Gods and Dropped Into the Abyss! (Light Novel) Vol. 4 (novel)
An ordinary teenager is transported to a fantasy world, accidentally gets on the bad side of the gods, and is dumped in the bottom of the world's deepest dungeon with no skills or magic. Ouch! Once there, he meets a mysterious girl...who happens to be undead. But despite her general dislike of humans, she decides to help him out.
Can the two of them make it back to the surface? They might just be a more powerful combo than anyone was expecting!