Luke agrees and then you can leave go back to the world map and then use the Tartarus and go to the far right continent on the left side and you'll find a broken bridge and you can land there afterwards head to the right and then go up and you will find Theor forest. On my first trip to Keterburg I got all the items, and most of them were. Then go back to the hotel and Jade knows what Luke just found out and asks for him to keep it a secret. The only real reason to get things in the casino is if you're at the point in the game where they JUST become available.
She aids the group and insists they spend the night but before that she asks Luke to talk to her alone go to to the hotel then Luke will seperate from the party then go back to Nephry and she will explain the darker side of Jade and how he tried to use the 7th fonon but it got out of control and it killed someone he cared about and tried to use fomicry to bring her back and it created a monster. Go up and to the left to find the governer's office and talk to her to have a scene and it turns out that she is Nephry, Jade's sister.
Go up and you will notice a Casino enter it to trigger a scene where Anise wants to gamble but is too young and she recieves the title Grown-up Child. Tales of the abyss casino guide, tales of the abyss keterburg casino.