Since you are fighitng Azraels, you are supposed to use Mystic Knights. Unfortunately, you have no equipment to fight them. Magic also makes them split.

The best thing you can do, is to run away, but since you can't do that, to the best of my recollection, have a White Mage use Exit on one or two of them (instant kill, but no bonuses, not that they give you EXP, just money). And then attack with your Master/Knight. This could make your life slightly easier.
You can also hope for a back attack, since Azraels only use physical attacks, ambushes are good for you, assuming that you put all 4 characters in the front row. Although, I seem to be the only person EVER who does that. If you Black Mage runs out of MP, then switch him to a Dragoon, if you still have the equipment. Jump works as well as a level3 Magic (Fire3, Ice3).