Venom: Lethal Protector - The Manga

From Kadokawa:
Eddie Brock, a journalist who had lost both his career and his reputation, found himself at rock bottom. He encountered a "Symbiote", an extraterrestrial parasite harboring a fierce hatred for Spider-Man, and the two bonded through their shared desire for revenge against the same target. When they merged into one, the terrifying nemesis "Venom" was born. A nightmarish monster unleashes a gruesome tale of vengeance.

Official Japanese