Yuka Muto is the child of Yugi Muto. As a narcissist, he only cares about himself, but the new friends he makes at Duel Academy start to change him, slightly. A group, known as Darkness X, has emerged, waiting to resurrect a beast from the depths of the Earth. Yuka, who learns new summoning methods, does his best to fend of Darkness X, but also questioning his choices.