Alice in Borderland began as a Japanese manga series by Haro Aso before becoming a live action Netflix series that premiered in 2020. Its story follows players trapped in an empty Tokyo who must compete in sadistic games to survive. The adaptation built a large international audience, and short character clips began circulating on soundboards and in fan edits. Rei is one of the names closely associated with fan discussion around the series, which helps explain why brief lines and name moments are saved, shared and reused as reaction audio.