SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the show, proceed at your own risk, or better, come back to this article later!
A group of bored delinquents are transported to a parallel wasteland as part of a survival game.
SPOILERS AHEAD
Alice in Borderland Season 1 Episode 3 Plot Summary and Synopsis
The following morning, Karube shows the rest of the group the radio he found during the game and the message he heard from it.
Realizing that Shibuki and Chōta only have until the end of the day to extend their visas, the entire group visits a botanical garden to attend their next game. The only participants, the group finds out that they have entered a “Seven of Hearts” difficulty-level titled “Hide-and-seek”, in which only one player will manage to leave the garden alive.
At the start of the game, the players are given facial recognition headsets and are assigned animals, with three of them being “sheep”, and the fourth being a “wolf.” To play, a player switches animals every time they lock eyes with another player, with the wolf at the end winning the game.
After a brawl, Arisu manages to become the wolf, and he hides from the rest of the group, who fail to find him. Using the headsets given to them at the start of the game, the group decide to spend their last minutes together chatting about their friendship.
Alice in Borderland Season 1 Episode 3 Ending
In the end, only Arisu makes it out alive.
Source: Wikipedia (CC BY-SA 3.0).