If you loved The Disappearance of Haruhi Suzumiya, try Sound! Euphonium: Ensemble Contest
A bridge between a film you've already seen and one most people haven't. Sound! Euphonium: Ensemble Contest has roughly 16.5× fewer votes than The Disappearance of Haruhi Suzumiya — 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.

The Disappearance of Haruhi Suzumiya

Sound! Euphonium: Ensemble Contest
What they share
Both films are directed by Tatsuya Ishihara, and they both carry the bittersweet, foreign gem mood tags, and they sit in Animation / Drama territory. If that's the register that drew you to The Disappearance of Haruhi Suzumiya, the second film will land in a comparable space — through a different lens.
What Sound! Euphonium: Ensemble Contest is
Bring It On if the cheerleaders played tubas. High-school band members face off in preliminary competitions to earn a spot at the Ensemble Contest. The new club leader is caught between factions and solos. It's a sweet distillation of the passions and petty grievances of adolescence.