Movie 4: Fire on the Mystic Island

A mysterious island appears where humans and demons live peacefully. Inuyasha went there with Kikyo once 50 years ago, and now returns with Kagome. A mysterious girl named Ai recognizes Inuyasha and has remained unchanged. However, when strange marks appear on the backs of Inuyasha and Sesshomaru, they are forced into a battle in which they can't avoid or stop!