In the Apocalypse, I Can Transmigrate

What was Zhang Yuan supposed to do after transmigrating to the Chaotic Domain? He was still at home, still had the same face, and was still in his own neighborhood, so why was he the only living person there? The streets were crawling with the walking dead. There was plenty of food at home, but when Zhang Yuan fought his way to the neighborhood gates, what did he find? A vast valley, surrounded by cliffs that soared into the clouds. What on earth was this Chaotic Domain?

Oh? A System panel appeared!

Oh? He could choose a class and level up!

Oh? There was even a beginner's gift pack!

Oh? Killing zombies gave him experience and dropped equipment, and he could level up and learn skills, too.

But! He was all alone. Couldn't he get a companion or two?

"Ding! Congratulations, Host! You've reached level 10 and unlocked the Lord System. Choose a territory, summon companions, and grow stronger. Brave youth, your journey will take you across the entire Chaotic Domain."