'The Meteo Rain'

In the future, meteorites fell from the sky and landed in Earths cities. The remaining multi-national co-orparations fought over suplies. Many people perished in the slaughter

Nano Parasites
Inside the meteorites were small, worm-like alien parasites known as Nano Parasites. As they infected many diffrent peoples brains, many people resisted the parasite and was in the process killed.

K's Backstory
The character K's parents were killed during the Meteo Rain. K's parents are never named or shown.