Watch InuYasha Movie 4: Fire on the Mystic Island Online

The island of Hourai, controlled by four demon gods. A girl who knows Inuyasha appears: "Ai." Unchanged for fifty years, what is this girl's secret? When the cursed seal comes to the surface, it begins Inuyasha and Sesshoumaru's newest battle!

Many years ago, Inuyasha's father, 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 his rival brother, Sesshomaru. He locked the third sword, the wrath-filled Sounga, away forever. Now, 700 years later, the Sounga's tremendous power has been awakened and the two brothers must set aside their differences and join forces in an unlikely and uneasy alliance to battle a force that spells doom for all mankind.

Inuyasha, Kagome and the others have cornered their arch-nemesis Naraku. Kagomes flying purification arrow and Inuyashas Tessaiga finally take Naraku down! Mysteriously, from that night on, the full moon strangely continues for several days.At that time, the unearthly appeared before Inuyasha and the others, calling herself "Kaguya, the Princess of Heaven"!What is the true relation of this greatest of enemies, who controls time freely, to Naraku? Right here and now, a new door opens on the magnificent tapestry of the warring country revolving around the Shikon no Tama!

Menoumaru, a demon and son of Hyoga, who has been sealed by Inuyasha's father 200 years ago, desires the power of Tetsusaiga for a special task. But instead of asking Inuyasha for it, he takes Kagome hostage and tricks him. The result is that Menoumaru turns even more powerful than before.Together with his female demon underlings Ruri and Hari he manages to turn friends into foes and lovers into haters.