Follow the tale of Nier, who one day decides to test if her faith of reincarnation was right after masking depression for so long. Though, the entities of the void decided to punish them thoroughly as Nier finds herself replacing the soul of a Royal Knight, Ashen. Now, she must navigate the complexities of this new world as she evades the mysterious figures that relentlessly pursue her, all while uncovering the secrets Old Ashen left behind in memories.