Arashi ga Oka is an adaptation of Emily Bronte's masterpiece, "Wuthering Heights." You don't need to read the book to understand this movie though. The film transplants the story from Bronte's English moors to the medieval Japanese countryside. I particularly liked Yusaku Matsuda and Tomoko Takabe in the film.
Overall, the film follows the book very well. It even covers the second half of the book, which I've noticed many "Wuthering Heights" adaptations skip. However, I thought it was just a little too long and it was startlingly dark at times.