Yu-Gi-Oh!: The Dark Side of Dimensions

In the opening, KaibaCorp is doing research on the Millennium Puzzle. Suddenly, a mysterious cloaked man is at the underground as one of Kaiba's bodyguards Roland tells him that he is behind schedule and to start digging. A year after the departure of the Pharaoh, Yugi Muto and his closest friends are in their final year of High School and are talking about what they will do in the future. Meanwhile, Seto Kaiba has commissioned an excavation to retrieve the disassembled Millennium Puzzle from the ruins of the Millennium chamber. The item had previously housed the soul of his rival, Atem, whom he hopes to revive in order to settle their score. The excavation is interrupted by Diva, who faces Kaiba in a game of Duel Monsters and steals two pieces of the recovered Puzzle. He keeps one fragment and gives the other to his sister Sera who passes it on to Yugi Muto, aware that he was the host of the Pharaoh. Read more on Wikipedia.