The announcement came with the release of the manga’s 23rd volume, as well as official guide book, in Japan.
Dorohedoro centers around a man named Caiman with no memory of his past… and a reptile head. The manga debuted in 2000 and ended this year.
Viz Media distributes the manga in English. Here’s how they described the first volume:
In a city so dismal it’s known only as “the Hole,” a clan of Sorcerers have been plucking people off the streets to use as guinea pigs for atrocious “experiments” in the black arts. In a dark alley, Nikaido found Caiman, a man with a reptile head and a bad case of amnesia. To undo the spell, they’re hunting and killing the Sorcerers in the Hole, hoping that eventually they’ll kill the right one. But when En, the head Sorcerer, gets word of a lizard-man slaughtering his people, he sends a crew of “cleaners” into the Hole, igniting a war between two worlds.
Source: Comic Natalie