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?
The mysterious island of Houraijima has reappeared after 50 years, and with its reappearance has brought the attack of four gods, the Shitoushin, who have their eyes set on the powers that protect and sustain the island. Now it's up to Inuyasha and his friends, along with Sesshoumaru, to find a way to defeat the powerful Shitoushin.
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.
InuYasha is a half-demon who was trapped in the Legendary Tree and was set free by Kagome, a girl who traveled 500 years through time. This time, both of them will have to face Menomaru, a Chinese demon whose father, known as Hyoga, came 300 years ago to invade Japan, but was stopped by InuYasha's Father. InuYasha and Kagome, along with Sango, Miroku, Shippou, Kaede and Myoga, will try to stop Menomaru in his becoming the most powerful demon ever.