The game is a spin-off from the Drakengard series, and follows the fifth ending of the first game, the events of which have left the planet Earth in a state of decay. Set over one thousand years after this, the game puts the player in control of the protagonist as he attempts to find a cure for an illness, known as the Black Scrawl, to which Yonah—either his sister or daughter, depending on the version—has succumbed. Partnering with a talking book known as Grimoire Weiss, he journeys with two other characters, Kainé and Emil, as he attempts to find a remedy and understand the nature of the creatures known as Shades that stalk the world. The gameplay borrows elements from various video game genres, occasionally switching between them and the main role-playing-based gameplay. Nier was designed to have gameplay that would appeal to players outside of Japan, where Cavia is based; additionally, the Gestalt version of the game has an older main character for the same reason. The music was composed by Keiichi Okabe, head of Monaca, a music composition studio, and several albums have been released.
