If you loved The Secret World of Arrietty, try Modest Heroes
A bridge between a film you've already seen and one most people haven't. Modest Heroes has roughly 16.6× fewer votes than The Secret World of Arrietty — 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
Both films are directed by Hiromasa Yonebayashi, and they both carry the tender mood tag, and they sit in Animation / Fantasy territory. If that's the register that drew you to The Secret World of Arrietty, the second film will land in a comparable space — through a different lens.
tender
What Modest Heroes is
Spirited Away meets The Twilight Zone. Three tales unfold as unusual heroes face challenges. Delivers poignant fantasy.

