This should be your third achievement of the game.
After fixing the statue's sword, you'll be going back through the area you just came from, and this time you'll have a couple of battles. Do a couple of melee attacks with
and then use
and
to draw a single line through enemies. This is the Power Slash technique. Repeat until the enemies are dead, and you should get this achievement by getting the Cherry Blossom Tree rank in each item.