If you're looking for anime similar to Shui Naodai, you might like these titles.
The catastrophe "Skyfall" was brought by the collapsed orbital space colony crashed into the Earth. Inside the crater at the crash site now inhabit Kaiju born by gene mutation. Ray, an avatar, comes to the area to collect the scattered "seeds", not knowing what really is going on there. He soon meets Mil, a mysterious girl. Is she a human, or a Kaiju?
The Digital World is a place where all kinds of digital monsters live together in harmony. That is, until one day their world is thrown into disorder when Yggdrasil, the super computer that governs the Digital World and everything in it, can’t handle any more data. Thus, it comes up with a solution: to restart the Digital World, erasing both the world and most of the Digimon along with it! Only a few chosen Digimon are transported to the new world, along with Digimon that carry the X-Antibody. The latter are considered errors, so Yggdrasil sends his Royal Knights to hunt them down. Young Dorumon, a X-Anibody Digimon on the run, is a small glint of hope for the Digital World. Will he, along with new friends and allies, be able to survive and save their new home?
In this "action epic" set in the run-down slums, the title character Domerica is transformed into a monster one day.