Zenless Zone Zero (ZZZ) is a free-to-play action role-playing game developed and published by miHoYo.
The game takes place in a post-apocalyptic futuristic haven known as New Eridu. Large pocket dimensions called Hollows plague the world, engulfing the land and spawning hostile monsters called Ethereals, who have wreaked havoc on humanity. After the fall of Eridu, a group of survivors established a bastion against the invaders known as New Eridu. The group survived the oncoming onslaught by extracting a substance called Ether from the Hollows, which is used as a potent energy source.
The story follows Wise and Belle, two siblings who are proxies and are secretly the legendary Phaethon. The siblings possess a special technology known as the Hollow Deep Dive System, which allows them to remotely monitor and navigate Agents within Hollows through the use of their Bangboo, Eous. As the player progresses through the game, their proxying capabilities are expanded with the addition of the A.I. Fairy, who can analyze Hollows.
