This is a heavily revised version of my earlier original logline that I shared here from 2017.
Original:
“On the verge of a succession crisis, a good mermaid princess is banished from her kingdom to the human world for her forbidden love of humans; but when her two wicked sisters usurp their father’s throne and destroy each other in a power struggle to rule the kingdom alone, she must choose between humanity and saving her people from the tyranny of her sisters.”