If you loved Hotarubi no Mori e, try Natsume's Book of Friends: The Waking Rock and the Strange Visitor
A bridge between a film you've already seen and one most people haven't. Natsume's Book of Friends: The Waking Rock and the Strange Visitor has roughly 60.5× fewer votes than Hotarubi no Mori e — 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.

Hotarubi no Mori e

Natsume's Book of Friends: The Waking Rock and the Strange Visitor
What they share
Theyboth carry the slow burn, tender mood tags, and they sit in Animation / Fantasy territory. If that's the register that drew you to Hotarubi no Mori e, the second film will land in a comparable space — through a different lens.
What Natsume's Book of Friends: The Waking Rock and the Strange Visitor is
A quiet woodland meets a lonely spirit. Natsume helps a small yōkai wake a sleeping giant only to realize the task may be impossible. A second tale follows Tanuma’s daily visits from a wraith that slowly drains his life, leaving Natsume to watch helplessly. Two vignettes that prove kindness can be its own kind of burden.