Yugi and his friends meet Ryou Bakura, a gentle new student with an interest in role-playing games. Little do they know that he has an alter ego as well, one that seeks to take Yugi's Millennium Puzzle for himself. He also has a history of playing Shadow Games with people, although people are unaware that it was Bakura's alter-ego, Yami Bakura. One day, Yugi and his friends visit Bakura's house to ask if they can play a game of Monster World. They end up playing, but with a twist - anyone Yami Bakura defeats will have their souls trapped inside their respective figurines.