If you loved Legend of the Galactic Heroes: Die Neue These - Intrigue 1, try Book Girl
A bridge between a film you've already seen and one most people haven't. Book Girl has roughly 3.1× fewer votes than Legend of the Galactic Heroes: Die Neue These - Intrigue 1 — 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.

Legend of the Galactic Heroes: Die Neue These - Intrigue 1

Book Girl
What they share
Both films are directed by Shunsuke Tada, and they sit in Animation / Drama territory. If that's the register that drew you to Legend of the Galactic Heroes: Die Neue These - Intrigue 1, the second film will land in a comparable space — through a different lens.
What Book Girl is
Here's a film that really wants you to know literature is important. A boy with writer's block gets drawn into the orbit of a book-obsessed girl with a strange eating habit. It's all very high school, and settles exactly where you think it will.