If you loved Persona 3 the Movie: #4 Winter of Rebirth, try Digimon Adventure: Last Evolution Kizuna
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.

Persona 3 the Movie: #4 Winter of Rebirth

Digimon Adventure: Last Evolution Kizuna
What they share
Both films are directed by Tomohisa Taguchi, and they both carry the bittersweet, foreign gem mood tags, and they sit in Adventure / Animation / Fantasy territory. If that's the register that drew you to Persona 3 the Movie: #4 Winter of Rebirth, the second film will land in a comparable space — through a different lens.
What Digimon Adventure: Last Evolution Kizuna is
You're a college student, adrift in studies and life. Your Digimon partner is always there, but a strange digital event portends change. As others grapple with similar threats, you learn growing up means parting ways. Taguchi's film understands the bittersweet ache of aging, even in a fantastical world.