| The subject of this article is non-canonical.|
While created as part of licensed material, the novel series The Lost Slayer takes place in an alternate universe, and as such is not part of the "real" Buffyverse.
She was the successor to the Slayer August, who was in turn the immediate successor to Faith since Faith had been killed a few months before Buffy's arrival in this alternate timeline. August was captured shortly after Buffy's arrival in the future, forcing Buffy to kill her in the subsequent fight. Anna's Watcher was the reinstated Wesley Wyndam-Pryce. Although Anna was initially resentful of Buffy, particularly after learning that August's death was the result of her attempt to force Buffy to kill her so that there was still a Slayer out there, she came to respect Buffy's abilities. Buffy spent her last few hours in the future training with Anna after the vampire army had been vanquished.