Until the end of times

The story follows a few groups of survivors during an apocalypse. Three on Earth, one in Hell and one in Heaven
In the year 2023 a tragedy occured that opened the gates of Hell and demons invaded Earth, hunting humans left and right.
Timeskip to 2032 where things start to change. Angels decide to get involved, demons evolve and humans start to finally gain the upper hand in this cruel war.
The story starts as an anthology within the first few chapters. Each chapter focusing on a different duo and their origins. Later on, the groups start to meet each other and create friendships and rivalries between them.