Not sure how the source material ended, but I would have preferred the survivors all remembered their time in Borderland. It seemed Arisu did at first when he said something like, it seemed like he had been unconscious longer. But then he does not even remember Usagi.
It would be interesting if they all remembered and became friends again in 'real life'. I don't think Arisu and Usagi's budding relationship survives in the real world without their memories. Arisu had a hard time getting past her emotional wall and only succeeded because of their extraordinary experiences. He doesn't have enough game to pull her in the real world.
Genuinely thought it was a happy ending which after all they had been through, I liked it !
Then we see the joker card and all bets are off lol
Not gonna lie , I got a shiver up my spine when I seen the joket card , what a twist right at the very end !