Sesshomaru hands the broken Tenseiga to a grieving Towa, leaving Setsuna’s fate in her hands. Will Towa be able to bring Setsuna back to life?
Having restored Setsuna to life and recovered from her exhaustion, Towa finds herself alone as Setsuna and Moroha begin searching for the mystical root needed to forge Towa a new sword.
Jaken recalls that fateful day fourteen years ago, when Zero placed a curse on Rin that would make her slowly rot away to an excruciating death. The three girls search for Bokusen-Oh, who may have a lead on the whereabouts of Towa’s new weapon.
The three girls arrive at Mount Musubi but are trapped by a powerful barrier. Moroha manages to escape and runs into something unexpected.
Rion used to travel the world with her father Kirinmaru, but one day, her soul was sealed deep within Mount Musubi. Longing for freedom and peace, Rion asks Setsuna to sever the thread of fate that connects her to her father.
Setsuna is kidnapped by Princess Aiya, daughter of the deputy shogun. Wanting to escape her studies, Princess Aiya begs Setsuna to be her body double for a day, but the princess’s new tutor turns out to be Hisui posing as his older sister Kin’u!
Revealing that he was once the young lord of the Mamidaira Clan, Takechiyo hires Moroha as a bodyguard to help him with the familial strife at his home. During training, Kohaku teaches Towa an important lesson about learning to run away.
Zero sets a trap in the garden of Nanahoshi, a demon who feeds on sadness. Kirinmaru pays Towa, Riku, and Rion a visit. Kohaku, Hisui, and Setsuna assist the chief of the demon slayers in the north.
Kohaku and the demon slayers struggle to put out the fires caused by the Flame Bulls. Mayonaka, who used to be a local deity, demands the people of Gokoku Village hand over the town’s divine object.
Moroha learns about her parents’ battle against Shogen Mamiana, the sealing of the Full Moon Raccoon Dog, and Takechiyo’s exile from his clan. Setsuna is attacked by the snow demon Yukinyudo. Zero targets Towa on the new moon.
Moroha and Takechiyo strike back against Shogen Mamiana. Setsuna experiences her first New Moon. Towa is trapped by Nanahoshi’s eternity bugs.
Zero unearths Towa’s sadness about growing up in the modern world and corners her with her memories of loneliness and suffering. Sesshomaru appears before the demon slayers and commands Setsuna to pay the Tree of Ages a visit.