In his previous life, he struggled through the apocalypse, risking his life in battles for supplies. Not only did he become someone else’s lapdog, he was also discarded without a second thought.
Reborn, he binds himself to an Apocalypse Self-Rescue System.
Stockpile supplies, get things for free, farm, and kill zombies.
In this life, with the System as his golden finger, he’ll kill any god or Buddha who stands in his way.