Alice in Borderland season 2's ending provides concrete answers to several overarching mysteries but does reveal why no one remembers what happened in the Borderland. Set in an alternate post-apocalyptic Tokyo, Alice in Borderland is based on Haro Aso's manga of the same name. Although the Netflix live-action adaptation takes a few creative liberties in its first two seasons, it stays true to most primary narrative elements and character beats from Haro Aso's Alice in Borderland manga. In its two-season runtime, it adapts all the major story arcs from the original manga and, like the manga, leaves several story elements to the viewers' imagination.

https://screenrant.com/why-no-one-remembers-alice-in-borderland-arisu-wake-up/