If you loved Aura: Koga Maryuin's Last War, try Assassination Classroom the Movie: 365 Days' Time
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.
You already loved

Aura: Koga Maryuin's Last War
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Assassination Classroom the Movie: 365 Days' Time
What they share
Both films are directed by Seiji Kishi, and they both carry the bittersweet, outsider mood tags, and they sit in Animation / Comedy / Drama territory. If that's the register that drew you to Aura: Koga Maryuin's Last War, the second film will land in a comparable space — through a different lens.
bittersweetoutsider
What Assassination Classroom the Movie: 365 Days' Time is
A talking octopus grades tests while dodging half-hearted death threats. Nagisa and Karma cram for finals with the fate of the planet on the line.