Can the three teenage daughters of demon dog half-brothers Inuyasha and Sesshomaru save their parents, themselves, and both realms from the menace of the seven mystical Rainbow Pearls?

As they continue their journey westward, Towa, Setsuna, and Moroha become ensnared in Zero's deadly trap. But Inuyasha, Kagome, and Rin finally make an appearance to protect their beloved girls! Their reunion is short-lived as the princesses must make their way toward Hizen. A terrifying sea creature blocks their path forward, and the only one capable of helping them is Shiori, a powerful half-demon who Inuyasha met years before!