Many years ago, the Great Dog Demon wielded the Three Swords of the Fang. Upon his death, he bequeathed a sword to each of his sons, Inuyasha and Sesshomaru, leaving the third sword, the wrath-filled Sounga, locked away forever. Now that the Sounga's power has been awakened, these two battling brothers must put away their sibling rivalry and face off against a force that spells doom for all mankind!