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.
but you must not open 
it once you return home.
pero está prohibido abrirla en la tierra.
Pero no la abra una vez en tierra.