Episode 30 (Hanyō no Yashahime)

Hisui the Demon Slayer is the thirtieth episode of Hanyō no Yashahime, and the 6th episode of the second season titled "The Second Act."

Synopsis

 * 1) Setsuna finally sleeps, but she is taken by Princess Aiya to her palace to attend her etiquette lessons in her place, while the princess sneaks away. Aiya's instructor turns out to be Hisui, his sister Kin'u having forced him to instruct the princess in her place.
 * 2) Princess Aiya enjoys in her newfound freedom, but is attacked by an octopus demon; Aiya is rescued by Hisui, Kin'u and Gyokuto.

Summary
Finally able to sleep after a whole decade, Setsuna is abducted by ninjas who serve under Princess Aiya and her father the Lord. 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 Kin'u.

On her way further outside the castle, Ayia is attacked by an octopus demon who plans to devour her. Fortunately, she is saved by Hisui, whom she immediately falls for, and assistance from Kin'u's sacred sutras and her twin sister Gyokuto's sent 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 Tree of Ages and plays her mother's lullaby on her violin again, while a deeply slumbering Rin listens from within the Sacred Tree of Ages' depths, shedding another tear.

Trivia

 * The origin of Kohaku's scar and Hisui's occupation is revealed.
 * Moroha has managed to get down to ryo of her master's debt.
 * This is the first episode where Kin'u and Gyokuto both debut in the current story line rather than in flashbacks from previous episodes when they are seen together. Gyokuto debuted in The Delicious Feudal Monks, and Kin'u debuted in The Stolen Seal.
 * Aiya marks Takonyudo as another apparition since her father saw Yotsume in disguise both in the premiere, and "Meeting Through an Apple".