Inuyasha the Movie 3: Swords of an Honorable Ruler

Long ago, the demon Inu no Taisho wielded the three Fang Swords, whose power over the three realms—Heaven, Earth, and Hell—would let their owner conquer the world. After his death, he left one sword to each of his sons: the deadly Tetsusaiga to Inuyasha and the benevolent Tensaiga to Sesshomaru, while the third, the infamous Backlash Wave, was sealed so its evil could destroy the world. Now, Backlash Wave has awakened, and the only thing that can stop it is the combined power of its two sister swords… Will two sworn enemies like Inuyasha and Sesshomaru be able to set their rivalry aside and join forces, just once in a lifetime, to end this terrible threat?