I always got my set up with at least one black mage and one monk. After killing all but one enemy, I just cast frog on the straggler. Then I'd arrange my characters in a cross with the monk in the middle. The other four would have accumulate and spam that while the monk spammed chakra.

I did this very early in the game. There's some sort of sick satisfaction with having samurai unlocked at the beginning of the second chapter.