The Knights of The New Dawn: Book 1
Ash Hogo-sha is a Knight, a part of a secret organization to keep the world balanced between good and evil, between light and darkness. She's powerful, being trained since she could walk. However, because she's a Knight that also means she doesn't have any friends. Or at least none she hangs out with.
She's in charge of guarding, protecting and operating a giant machine disguised as a building. But when Sasuke Uchiha needs a new place to stay, the Hokage decides it's time for Ash to get up and make some friends even if she's disguised as a boy. So she's got a new housemate who seems dead set on figuring out the secrets of the Yoroi building and she's also been placed on a team of genin.
This will be fun.
(By: Strawhat_pirate- A war book)