Yuugi Mutou, often a target for bullies due to his frailty, finds solace in his childhood friend Anzu Mazaki's protective presence. Hoping for a loyal companion who truly understands him, Yuugi unlocks the power of the Millennium Puzzle, an ancient relic from his grandfather's shop. Upon its completion, a new persona emerges within him—the formidable and enigmatic 'King of Games,' Yami Yuugi. Unlike Yuugi, Yami Yuugi is dark, resolute, and formidable, stepping in to mete out justice through intense 'Shadow Games' to those who wrong him. With high stakes and the threat of confronting one's inner darkness, Yuugi navigates this newfound duality within himself.