Bound to the "Corpse Friend" System — I'm the Only One Not Attacked by Zombies.

In secret, high school student Silver, who was involved in shady dealings, originally wanted to visit his adopted younger sister, but unexpectedly found himself transported to a parallel world overrun by zombies. In a desperate situation where all of humanity had become zombie fodder, he alone gained the ability of the "Zombie Companion"—never to be attacked by any zombie. Determined to find his only remaining family, the reclusive boy set out on an apocalyptic journey with a stray black dog he had picked up. But he soon discovered: [Blackie, sometimes, compared to zombies, we should be more wary of humans...] [Woof woof!!!] [Shh... Keep it down!]