InuYasha the Movie: Fire on the Mystic Island (2004)
InuYasha the Movie: Fire on the Mystic Island is a 2004 anime film directed by Toshiya Shinohara and written by Katsuyuki Sumisawa. It is the fourth and final film of the InuYasha movie series. It was released in Japan on December 23, 2004 a few months after the last episode of the first series aired. The film has been licensed in America by Viz Media and was released on August 1, 2006.
More at Wikipedia.