If you loved Tetsuo: The Iron Man, try The Adventure of Denchu-Kozo
A bridge between a film you've already seen and one most people haven't. The Adventure of Denchu-Kozo has roughly 13.7× fewer votes than Tetsuo: The Iron Man — 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 Shinya Tsukamoto, and they both carry the body horror, surreal mood tags, and they sit in Horror / Science Fiction territory. If that's the register that drew you to Tetsuo: The Iron Man, the second film will land in a comparable space — through a different lens.
What The Adventure of Denchu-Kozo is
A summer afternoon in Tokyo, the hum of vending machines. A boy feels something heavy crack through his spine like a branch splitting under snow. By dusk the lattice of power lines sprouts from his shoulder blades. Shadows lengthen across an empty playground. Steel fangs flash in the glow of flickering neon. Each spark between them promises a new sunrise. A fever dream of 1987 cyberpunk manga.

