Blade & Bastard, Vol. 1 (manga)

Deep in the depths of the dungeon, a man spends his days scouring the treacherous floors for bodies of dead adventurers. His name is Iarumas, and he has no memory of the life he lived before he was resurrected from a corpse. The living keep their distance from the cold, sullen man—Iarumas consorts primarily with the dead. That is, until he meets Garbage, a feral young swordswoman who is the sole survivor of a massacred party. With Garbage by his side, Iarumas ventures farther, searching the dungeon for clues to his past while avoiding the inevitability of a permanent ashen demise…

Volume 1 of the Blade & Bastard manga series by Kumo Kagyu.