A stranger comes to a fishing village, which plans to catch lots of fish through poisoning the river.  As the villagers debate, they are warned against this by a traveling priest. A fisherman saves a little turtle and is taken to an undersea palace. Two boys go to ask the fire god to help them with a demon who's been raiding their village.
Once upon a time, there was a valley 
known for its giant char fish.
Érase una vez hace mucho tiempo
Hace mucho, mucho 
tiempo, en algún lugar,
Era uma vez, num lugar, um rio
famoso pelo seu salvelino gigante.