Encyclopedia Entry:
A type of succubi who have undergone a peculiar development that live in villages called “shinobi no sato” deep within mountains and other places people come near. “Kunoichi” were originally human ninja women, but when the demon lord took over some of them were changed into succubi, originating the “kunoichi” as monsters. Their wings have atrophied, but compared to the original type their physical abilities are extremely high, and they excel at swift, agile movement. Their long, slender, yet powerful tail isn’t just used for binding and carrying their prey, it also serves as a grappling hook, allowing them to freely move on walls and ceilings. They’re brought up with various training from childhood, so they excel at secret techniques and martial arts. They use spells called “ninpo” such as “bushin no justu” etc. to perplex opponents. Being highly capable succubi, they’re also adept at bedroom techniques for pleasing men. They are renowned as a first rate secret organization, and kunoichi are dispatched from shinobi no sato as mercenaries to serve prominent monsters and humans from monster friendly territories, not just in Zipangu, but throughout the entire world.