I play it back and I am at chapter 15 when I check this reply. By the way after I defeat Elize you can still continue the story if I continue the story does the party disband after I continue the story and what happen if I finish.
Don't worry, the party will not disband. Nothing will get permanently lost by playing past chapter 15, and you can even jump to different parts of the story at no cost by using the "Story crystal".
