The upgraded prequel of NieR:Automata. A kind young man sets out with Grimoire Weiss, a strange talking book, to search for the "Sealed verses" in order to save his sister Yonah, who fell terminally ill to the Black Scrawl.

In the far distant future, humanity is on the brink of extinction. A black scrawl disease and strange beasts threaten the world. A kind-hearted young boy makes a promise to his little sister. A thousand-year lie that would live on for eternity.

The protagonist is a kind young man living in a remote village. In order to save his sister Yonah, who fell terminally ill to the Black Scrawl, he sets out with Grimoire Weiss, a strange talking tome, to search for the "Sealed verses."