Wadanohara and the great blue sea

The young witch Wadanohara has just returned from a journey across the oceans, searching for a clue to her lost memories. Now that she has come home, along with her familiars Memoca, Dolphi and Fukami, Wadanohara must continue her quest while ensuring the safety of the ocean kingdom she hails from. But a mysterious figure from her past has appeared and demands that she leave her ocean home forever.