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...