If you loved Sasaki and Miyano: Graduation, try given The Movie: Hiiragi Mix
A bridge between a film you've already seen and one most people haven't. given The Movie: Hiiragi Mix has roughly 5.1× fewer votes than Sasaki and Miyano: Graduation — 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.
What they share
Theyboth carry the bittersweet, tender mood tags, and they sit in Animation / Romance territory. If that's the register that drew you to Sasaki and Miyano: Graduation, the second film will land in a comparable space — through a different lens.
What given The Movie: Hiiragi Mix is
Looks like we're doing the band anime thing again. Ritsuka Uenoyama finds himself in a complicated situation when asked to play guitar for Mafuyu Sato's former bandmates at their debut show. It's a classic will-they-won't-they, but with more guitars.

