Hanyou no Yashahime: Sengoku Otogizoushi - Ni no Shou

Synopsis

Finally being able to sleep after a whole decade, Setsuna is abducted by ninjas who serve under Princess Aiya and her father the Lord. Princess Aiya coerces Setsuna to take her lessons for her as the Princess leaves via palanquin to enjoy her newfound freedom outside the castle. Setsuna is surprised to see that the instructor is none other than Hisui, who has been forced into taking the place of his twin elder sister Nun Kin'u. On her way further outside the castle, Princess Aiya is attacked by an octopus demon who plans to devour her. Fortunately, she is saved by Hisui, who she immediately falls for, and assistance from Kin'u's sacred sutras and her twin sister Gyokotuo's scent-beads. The Lord discovers his daughter's duplicity and severely lectures her as Setsuna returns to Kaede's village, where a relieved Towa hugs her. Setsuna does not inform her twin about her predicament and leaves to train in further developing and increasing her Yukari no Tachikiri's divinely powerful abilities and unique techniques to their full strength. Lost in thought and still uncertain about the fact that saving Rin from Zero's deathly curse is up to her alone, Setsuna goes to the Sacred of Ages and plays her mother's lullaby on her violin again as the deeply sleeping Rin continues to listen from within.

(Source: Wikipedia)