HOTD: As a Zombie, I Devour Ghouls and Parasites

I was born as a shitty zombie in the world of High School of the Dead. But I soon discovered that it wasn't just a zombie apocalypse. There were also ghouls hunting in the shadows and alien parasites taking over bodies. To survive, I discovered that I could evolve by devouring other monsters. This is the story of how, to save those I love, I must become the ultimate predator. ××× Worlds: High School of the Dead - Tokyo Ghoul - Parasyte - Hellsing — Description from novelcodex.org