To unlock the next scene in the Lion Temple you need to wait until the game day.
To complete the main story phase with the main demon in the swamp, you need to use an artifact that can be taken from the prison near the swamp.
An anti-confusal potion will also help.
The quest to save Selene usually begins in the Dream World.
Well, don’t hesitate to consult with the game’s Artificial Intelligence (Fortune Teller, Bartender, Library).