The Good Shinobi

When her ruthless stepbrother marks her for death, Yin Law discovers she is the true heiress of the Sute-go ninja clan. She is rescued by Nero, her office janitor... a rogue shinobi, hilariously awkward virgin, and secret guardian who has watched over her from the shadows since childhood. Now, as a hidden war closes in, Nero must keep Yin alive and train her to become a shinobi herself before her enemies erase her for good.