How to advance in the main quest? I'm going to capture new cards and nothing happens
What stage are you on? If you mean the part where you need to farm the pixie grove, you need to beat several battles and then the girl you encounter after
How to release the scene that is not about the main characters and Mia?
If you mean the Mia scene, you should end the battle dealing little or no damage to her (just skip turns)
