The fourth movie in the Inuyasha film series was released in Japan.
The original Inuyasha anime, which sets the stage for the movies, concluded broadcasting in Japan.
Inuyasha and his friends learn about a mysterious island inhabited by the incarnations of the Wind Tunnel's souls.
The group sets out to the island to investigate and confront the forces tied to the souls trapped within Sesshomaru's Wind Tunnel.
They face a group of powerful demonic entities that protect the island and threaten the safety of the souls therein.
The team discovers the souls in the Wind Tunnel were transformed and imprisoned by ancient magic linked to the island.
A fierce battle ensues against Hakudoshi, a new antagonist intent on harnessing the island's power and destroying Inuyasha's group.
With the defeat of Hakudoshi, the group manages to release the trapped souls and seals the island’s dangerous magic.
