Drakengard, known in Japan as Drag-On Dragoon, is a 2003 action role-playing video game developed by Cavia and published by Square Enix for the PlayStation 2. The game is the first installment of the Drakengard series and features a mixture of ground-based hack-and-slash, aerial combat, and role-playing elements which have become a staple of the series. The story is set during a religious war between two factions—the Union and the Empire—with the war tipping in favor of the Empire. The player controls Caim, a deposed prince of the Union, in his quest for vengeance against the Empire. Wounded in battle while protecting his sister Furiae, he is forced to make a pact with a red dragon named Angelus as they journey together on a quest to prevent the Empire from destroying magical seals that keep the world in balance.

Yoko Taro is a Japanese video game director and scenario writer. Starting his career at the now-defunct game company Cavia, his best-known work was on the action role-playing video game series Drakengard, and its spin-offs, Nier and Nier: Automata. Yoko was born in Nagoya, Aichi, and studied at the Kobe Design University in the 1990s. While he did not initially intend to pursue a career in video games, after working at Namco and Sony, he joined Cavia and became the director and scenario writer for the first Drakengard game. He has since worked extensively on every game in the series, and on mobile titles, after becoming a freelancer after Cavia's absorption into AQ Interactive.