If you loved Midori, try Mermaid Forest
A bridge between a film you've already seen and one most people haven't. Mermaid Forest has roughly 7.8× fewer votes than Midori — 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
Theyboth carry the dread mood tag, and they sit in Animation / Horror territory. If that's the register that drew you to Midori, the second film will land in a comparable space — through a different lens.
What Mermaid Forest is
A rocky shore. Eternal autumn. Fishing nets. Yuuta has lived for centuries since tasting mermaid flesh. He searches for a cure alongside Mana, another immortal, but finds only grotesque villages obsessed with perverse rituals. A grim, episodic fable in the manner of classic U.S. anthology comics.

