Dorohedoro 1 Hayashida Q (2010)

This first volume follows Caiman, who has been cursed by a sorcerer with a reptile head and stripped of his memories of life before the transformation. A spectre lives inside him, but Caiman is completely immune to magic. Together with his best friend Nikaido, he hunts sorcerers in the Hole, looking for the one who can undo his curse and killing the rest. When En, the head sorcerer, hears about a lizard-man slaughtering sorcerers, he sends a crew of cleaners into the Hole, igniting a war between two worlds.