Three Sisters vs. Female Swordsman: Kunoichi Rape Secret Technique Side Story (2008)

Sinopsis

Introducing the Kasakura Adult Period Drama! The life-or-death battle of the female ninjas Mizuki, Hazuki, and Utatsuki, entrusted with protecting Amakusa Shiro, begins now. Standing in their way is Shiori, the most powerful and beautiful female swordsman of the Niten Ichiryu school! Will the legendary secret technique, "Iromamushi Ninjutsu," be manifested? What will be the sad fate of the three female ninja sisters, who are captured and tortured by the shogunate's pursuers? A fantastic story unfolds.