With their greatest foe seemingly defeated, Inuyasha and his friends return to normal lives. But their short period of peace is once again shattered as a new enemy begins to emerge. Kaguya, the self-proclaimed Princess from the Moon of legend, plots to plunge the world into a perpetual night of the full moon. Inuyasha, Kagome, Miroku, Sango, and Shippo must once again unite to face a new threat.

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 the force that spells doom for all mankind.

"Hearing that Kyoto may be alive, Inuyasha sets off to find her in hopes of a reconciliation, but when he expresses his true feelings, Kyoto embraces him only to extract her revenge."--

A mysterious demon attacks a group of innocent wolf demons distantly related to Inuyasha's rival koga. In the ensuing battle, Moryomaru enters the fray, and Koga ends up at a terrible disadvantage. Inuyasha and the others come to his aid but is rescuing Koga worth the terrible price they will have to pay?

Kagome is an ordinary modern schoolgirl living an ordinary life. Who would have thought the dried-up old well on the site of her family's shrine would be a gateway to Japan's ancient past? Drawn through the gate against her will, Kagome finds herself battling demons for control of what she thought was a worthless trinket but is actually a powerful magical gem, the Shikon Jewel! Together with an unlikely ally, the half demon Inuyasha, Kagome begins...