Trust your cards, not your brains! Yu-Gi-Oh! tells the story of Yugi Mutou, a shy young lad who loves a variety of games, but is frequently intimidated about. One day, he solves an ancient artifact called the Millennium Puzzle (Sennen Pazuru?), causing his body to play host to a cryptic spirit with the character of a gambler. From that moment onwards, whenever Yugi or one of his buddies is endangered by those with darkness in their own hearts, this other Yugi reveals himself and challenges them to dangerous Shadow Games (Yami no muo, lit. "Games of Darkness") which show the real nature of someone else's heart, the losers of these competitions regularly being subjected to a black punishment called a Penalty Game (Batsu Gomu?). Whether it's dice, cards or role playing games, he'll take on difficulties from anybody, anyplace. Yugi and his friends discover that this man in of his puzzle is in fact the heart of a nameless Pharaoh from Egyptian times who'd lost his recollections as the show progresses. As Yugi and his comrades try to help the Pharaoh recover his memories, they are going through many trials as they wager their lives facing off against gamers that wield the cryptic Millennium Items (Sennen Aitemu?) and the black power of the Shadow Games.