The movie adventures of Inuyasha, Kagome, Shippo, Sango, and Miroku as they face Menomaru, a demonic enemy brought to life by a jewel shard, defeat Naraku, only to have to deal with a new enemy named Kaguya. Then deal with a third sword of Inuyasha's father called So'unga, unleashed from its centuries-old seal, and attempt to rescue children trapped on the mysterious island Houraijima by the wrath of the four gods, the Shitoushin, or "The Four War Gods"