The Calamity Born from Hunt: Showdown

At some point, more and more space-time rifts began appearing in our hometown.

After obtaining the System, I found I could project myself into the worlds on the other side of those rifts and wage war with the mindset of a player.

I am the only player, and I am their natural disaster.

(Infinite-worlds style at first, cross-world wars later. In order: Hunt: Showdown, borrowing only some elements; Cyberpunk 2076/77, featuring some of the original story.)