I love Chrno Crusade...

I just watched 11 and saw the preview for 12..

How is it gonna be a 13 episode series...?!!? It has to be longer...cuz there is so much they have to do in the series. They cant just sum it up in episode 13. But maybe Iam wrong, but from the preveiw from 12 it doesnt look as a big part of the main story. Thus leaving one episode to complete the series, that cant happen.