Honkai Impact 3rd follows Valkyries as they defend the world from Honkai, the “mysterious power responsible for destroying human civilization countless times.”
Don't get the steam version, get the official launcher (or Twintail if you're on Linux like me). Mainly because if you want to sync your progress with mobile, you won't be able to do that with the steam version.
That being said, I played the game from start to finish (part 1) and KIANA X MEI FOREVER (I love when yuri transcends government anti-gay ...