Zenless Zone Zero Lore Explained: https://youtu.be/OGfqvsDgTlE?si=88dib4BY_0LeAcoi
Here's a quick recap of Zenless' Version 1.0 story without any fluff.
00:00 Intro
00:31 Prologue
04:40 Chapter 1: Cat's Lost and Found
09:51 Chapter 2: A Call From the Hollow's Heart
13:41 Chapter 2.5: Mission Unthinkable
17:17 Chapter 3: The Midnight's Pursuit
20:55 Zenless Zone's Story is GOOD