Their first encounter with the enemy having gone badly, our three main characters fall back, regroup, and get subjected to Issac's ability to unhinge people a few more times. This costs them a few friends and allies. But they start doing their homework (rather than relying on a magical revelation/weapon/asspull) and trying to formulate ideas of how to strike back.
Still enjoying this series very much and looking forward to more.
ES vol. 3 and vol. 4 are both available from Right Stuf, Intl., an online retailer specializing in anime and manga.