Apocalypse! From the Start, I Have a Reaper's Blade

[Apocalypse] [System] An unknown entity suddenly appears and starts playing a game with the people of Blue Star. The city where Z City is located falls into the Apocalypse, becoming a playground for zombies. Should you keep growing stronger, or lie low in one place? After personally killing the person he loved, Jiang Li picks up the Rebirth Blade and sets out on the path to becoming strong.