“Two Sisters” (1991) IMDb
Caroline Leaf (director).
Two women live together in an old house on an island, one of them “protecting” the other, who is a writer, from the outside world. One day a diehard fan swims to their island and disturbs the equilibrium.
Original story by Leaf, animated by scratching down fully exposed 70 mm film. Good story, apt medium, suitable character design, but lacking in awesome.