If you loved Inuyasha the Movie 2: The Castle Beyond the Looking Glass, try Inuyasha the Movie 4: Fire on the Mystic Island
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Inuyasha the Movie 2: The Castle Beyond the Looking Glass

Inuyasha the Movie 4: Fire on the Mystic Island
What they share
Both films are directed by Toshiya Shinohara, and they both carry the epic, foreign gem mood tags, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Inuyasha the Movie 2: The Castle Beyond the Looking Glass, the second film will land in a comparable space — through a different lens.
What Inuyasha the Movie 4: Fire on the Mystic Island is
Seven Samurai if the samurai are battling gods. A long-dormant island resurfaces, bringing with it a quartet of malevolent deities eager to plunder its power. This animated adventure benefits from a rare team-up, as Inuyasha and Sesshomaru find common cause.