Apocalypse Game: I Get a Cheat Code from the Start!

[Apocalypse Game + Otherworldly Arrival + System + Survival + Power Fantasy]

I somehow got pulled into an apocalypse game, and I actually bound myself to a cheat-code System?

Just enter a cheat code and get a peerless divine weapon!

A katana with unlimited durability!

A safehouse that even a tank can’t smash!

Armor that keeps leveling up!

With all this gear, what can zombies do to me?

Heh heh heh!

Just watch me carve a path through the apocalypse!