Inuyasha, a half-demon swordfighter, and his friends must join forces with an unlikely ally to save the world from total destruction when a demonic sword's evil powers are awakened. The sword, So'unga, was once possessed by Inuyasha's father, the Great Dog Demon, but was sealed away due to its malevolent nature. Now, it has returned and seeks to destroy humanity. Inuyasha and his older brother, Sesshomaru, must put aside their differences and combine the powers of their swords, Tessaiga and Tenseiga, to defeat So'unga and save the world. Alongside their allies Kagome, Miroku, Sango, Shippo, and Kirara; they embark on a dangerous quest to stop the evil sword and its new host, Takemaru, who seeks revenge on Inuyasha's father by killing his sons. Will they be able to overcome their rivalry and unite their forces to defeat the powerful So'unga?

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Inuyasha the Movie 3: Swords of an Honorable Ruler was released in theaters on September 6, 2005.