Instructions
Throw your boomerang at the first Ghini to appear when entering a graveyard. Hitting it with your boomerang will cause it to be stunned for several seconds. The boomerang can be found in the first dungeon of the game.
Avoid other Ghinis that appear in the graveyard. Other Ghinis can appear if you touch the tombstones in the graveyard, but these ghosts will be invulnerable to all attacks.
Attack the first Ghini ghost to appear using your sword. Several hits with it should be enough to defeat the ghost. Once you kill the first Ghini, all others that have appeared will then disappear.