Help me find this anime — possibly a movie or single episode, 2D animation
 
	 
 
	
		I watched it as a kid, probably early 2000s or before 2010.
	
	
		The animation style is 2D, not the typical “big-eyed” modern anime style — more slim, beautiful eyes.
	
	
		The story centers around sisters (or at least multiple female leads who are siblings).
	
	
		It has a strong connection to the ocean or a village near the ocean.
	
	
		Characters wear traditional or village-style clothing — not modern outfits.
	
	
		One key scene I remember is one sister or female character practicing her water-based powers in the ocean or a water body. She finally manages to control or splash the water dramatically.
	
	
		The plot involves water or ocean-related magic or powers.
	
	
		It might be from Japan, Korea, or China.
	
	
		It’s either a single-episode movie or a short OVA — not a long TV series.
	
	
		The theme includes some adventure and maybe a love story
	
	
		The animation doesn’t have heavy action like fighting scenes but is more focused on emotional storytelling and magical powers.