If you loved Love Live! Sunshine!! The School Idol Movie: Over the Rainbow, try High☆Speed!: Free! Starting Days
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

Love Live! Sunshine!! The School Idol Movie: Over the Rainbow
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High☆Speed!: Free! Starting Days
What they share
Theysit in Animation / Comedy territory. If that's the register that drew you to Love Live! Sunshine!! The School Idol Movie: Over the Rainbow, the second film will land in a comparable space — through a different lens.
What High☆Speed!: Free! Starting Days is
A group of middle school swimmers discovers synergy is harder than a flip turn. Haruka and Makoto, freshmen with competitive streaks and clashing strokes, reluctantly team up to avoid forfeiting races. The film stops just short of questioning whether chlorine actually preserves motivation.