If you cannot read Japanese, you might want to visit the Google Translation instead.
If two enemies are at the same spot, it might hit a different enemy than the one it was originally intended to hit. For these, a Priest swings the staff, and a bolt usually represented by an "X" that is the same color as the staff will appear at all enemies within the priest's range.
Most staves use a direct attack which immediately hits multiple enemies and cannot miss.