freeOK概要：A professor suspects that a malicious assassin may have found a way to return from the grave and continue his violent revelry. When a group of teenagers decided to play a prank on Halloween and steal the killer's body from the morgue, their fear was proven to be real. When teenagers recite a spell from an old magic book on a corpse, the corpse and all the corpses in the nearby cemetery begin to revive.
