Well... It's actually the product of the author's brain.
The female protagonist is Shifengin Yoruichi and her sister Shifengin Nihility
This article is about Yoruichi and Urahara's escape, and then the void fell into the space-time rift, and Yoruichi also fell in, and then their various journeys in the Naruto world.
Wahahahahahahahaha! ! [The author leans over]