If you loved HAIKYU!! The Dumpster Battle, try Haikyu!! The Movie: Battle of Concepts
A bridge between a film you've already seen and one most people haven't. Haikyu!! The Movie: Battle of Concepts has roughly 3.2× fewer votes than HAIKYU!! The Dumpster Battle — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

HAIKYU!! The Dumpster Battle

Haikyu!! The Movie: Battle of Concepts
What they share
Both films are directed by Susumu Mitsunaka, and they both carry the foreign gem, playful, uplifting mood tags, and they sit in Animation territory. If that's the register that drew you to HAIKYU!! The Dumpster Battle, the second film will land in a comparable space — through a different lens.
What Haikyu!! The Movie: Battle of Concepts is
Rocky meets anime volleyball. Karasuno High faces Shiratorizawa Academy in a battle for the ages. It's a chance to relive the thrills for fans of the series.