If you loved Fireworks, Should We See It from the Side or the Bottom?, try Hana & Alice
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.

Fireworks, Should We See It from the Side or the Bottom?

Hana & Alice
What they share
Both films are directed by Shunji Iwai, and they both carry the bittersweet, tender mood tags, and they sit in Drama / Romance territory. If that's the register that drew you to Fireworks, Should We See It from the Side or the Bottom?, the second film will land in a comparable space — through a different lens.
What Hana & Alice is
Here's a film about teen girl antics, for those who enjoy that sort of thing. Two best friends both crush on the same somewhat hapless boy. After an accident gives him amnesia, they both decide to take advantage. It's a slight film, but it certainly delivers on awkward teen romance.