Mermaid -- or more accurately, "Rusalka," the original title -- is a Russian import, a beautiful, whimsical and ultimately dark tale of a girl who is born with a magical sense of life and luck.
Alisa (or Alice, depending on subtitles) reveals that she was born from a mythic mating of a sailor and a Venus-on-the-half-shell version of her mother in the sea. Alisa grows up with a view of the magical realism around her as she and her mother and elderly grandmother move from the seaside to the the big city.
In the city, her sense of wishing things to be true and of bestowing luck itself becomes both good and bad for her. When she meets a man on whom she develops a crush she begins to confer her magical sense of the world to him.
That's not the best write-up of the movie you might read. It's a funny, quirky -- and lovely -- story of the absurdity of life as played out from a singular viewpoint: a girl to whom life seems, itself, a wonderful game. I loved it. It ends with a shock, but it's a surprisingly good ending.
The young actresses who play Alisa (first, as a very little girl and then as a teenager) are pitch perfect. There's a Fellini-esque quality to the movie that never quite goes into the overblown circus of the Italian filmmaker's realm but gets near its edges.
Here's a movie trailer for it, which will give you a better sense of it: