InuYasha the Movie 3: Swords of an Honorable Ruler

Inuyasha - Tenka hadou no ken is a movie starring Kappei Yamaguchi, Satsuki Yukino, and Kôji Tsujitani. The legendary sword, So'unga, which belonged to the Great Dog Demon, has been unleashed. It seeks to cover the Earth in an...
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?