Year: 1999, when the infection began.

Not too long ago,, a weird object from space fell down to earth in Nebraska. "HOME" named it "AZ-001". And after that, an infection began. Scientists called it "Starkill".

You locked yourself up in your home, not wanting to be infected as well.

The infection seemed to be spreading like wildfire, which was horror for the entire world. People turn into monsters...