The beautiful blue sky, the vast blue sea. A tiny boat in crystal clear ocean. The sea witch Wadanohara, along with her familiars, is returning to her underwater hometown after a long time away. But before her...

Rosé Ovair thinks she woke up in a romantic love story where she's the rich heroine with a handsome fiancé, but her new home... isn't quite right. Her family seems to be keeping the cause of her father's death...