If you loved Inuyasha the Movie 3: Swords of an Honorable Ruler, 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 3: Swords of an Honorable Ruler

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, playful, uplifting mood tags, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Inuyasha the Movie 3: Swords of an Honorable Ruler, 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.