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.
it had been since he'd 
come to Ryugu Palace...
había transcurrido desde que 
llegó al palacio Ryugu...
cuánto tiempo llevaba en Ryuuguu...