If you loved Sekaiichi Hatsukoi Movie, try Happiness Charge Precure! the Movie: Ballerina of the Doll Kingdom
A bridge between a film you've already seen and one most people haven't. Happiness Charge Precure! the Movie: Ballerina of the Doll Kingdom has roughly 3.1× fewer votes than Sekaiichi Hatsukoi Movie — 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.

Sekaiichi Hatsukoi Movie

Happiness Charge Precure! the Movie: Ballerina of the Doll Kingdom
What they share
Both films are directed by Chiaki Kon, and they both carry the playful mood tag, and they sit in Animation / Comedy territory. If that's the register that drew you to Sekaiichi Hatsukoi Movie, the second film will land in a comparable space — through a different lens.
What Happiness Charge Precure! the Movie: Ballerina of the Doll Kingdom is
A troupe of cheerful magical girls gets yanked into a doll kingdom where the local ballerina pleads for help—very meta for a show that feels like a toy ad gone rogue. Sent to cure a land of sorrow and dancing plushies, they discover Prince Zeke’s glittering utopia is being nibbled by Black Fang’s gloom-ray. The only thing more adorable than the premise is the studio’s refusal to let anyone sleep through it.