If you loved Guinea Pig Part 2: Flower of Flesh and Blood, try Guinea Pig: Mermaid in the Manhole
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.
You already loved

Guinea Pig Part 2: Flower of Flesh and Blood
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Guinea Pig: Mermaid in the Manhole
What they share
Both films are directed by Hideshi Hino, and they both carry the body horror, dread mood tags, and they sit in Horror territory. If that's the register that drew you to Guinea Pig Part 2: Flower of Flesh and Blood, the second film will land in a comparable space — through a different lens.
body horrordread
What Guinea Pig: Mermaid in the Manhole is
Sewage stench, shivering neon. A painter’s studio walls darken with drain-water murals. He rescues a malnourished mermaid from the muck, nurses her in a bathtub lined with cracked tiles, her silver failing to gleam.