The Merciless Tiger Swirly has been acting odd. As Yuga and company try to figure out a way to bring him back to normal, they learn that there is a forbidden card that can control people through Dueling. Who would enjoy doing something so terrible to other people? Since Nanaho might have something to do with this forbidden card, Yuga and Luke decide to look for her. However, standing in their way is someone they could have never expected...!