My Monster Fuses Everything

Apocalypse befell, and roommates performed a skyward ritual. As the fog descended, the Book of Blood Spirit appeared in the hands of all survivors, and only those with a Contract monster could survive. Su Han directed his gaze to the neighbor who had already mutated and twisted, silently pulling out a gleaming fruit knife... Grotesque meat corpses, giant spiders with gaping mouths, eyeballs enveloping the city, one-eyed sharp-toothed hand monsters... Civilization fell, cities shattered, and all humans became meat for the monsters. There was only one way to survive: Use monsters to fight monsters.