How to explain? It's like Harold & Maude, only if both characters appeared to be 12 years old and Maude was actually a vampire. And if it had the icy surroundings and slowly building sense of dread as in The Shining. With Scott Farkus from A Christmas Story making an appearance as Harold's tormenter. Oh yeah, and it's all in Swedish -- with all the awkward touches of pre-adolescent sexuality that might imply.
Does that describe it? It's the best I can do.