Inuyasha and his brother, Sesshomaru, each inherited a sword from their father after his death. However, their father had a third sword, named Sounga, that he sealed away. Seven hundreds years after his death, Sounga awakens and threatens mankind’s very existence. How will the children of the Great Dog Demon stop this unimaginable power?

With their most formidable foe vanquished, Inuyasha and his comrades begin returning to their everyday lives. But their peace is fleeting as another adversary emerges: Kaguya, the self-proclaimed princess from the Moon of Legend, hatches a plot to plunge the world into an eternal night of the full moon. Inuyasha, Kagome, Miroku, Sango and Shippou must reunite to confront the new menace.