Serena sees Ash crying, and realizes he has a giant scar running down his back. Ash tells Serena about it, but the next day, Ash is possessed by a demon who he names Onikage, and he has 13 days to tell Bonnie and Clemont about it. But the man who gave it to him swore he would hurt, and possibly kill, Ash and Serena if he told. How will Ash deal with this? Read to find out.