The Talking Fish / Urashima Tarou / The Demon`s Handprint

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. Source: crunchyroll