The case of the moving castle! The story is a classic fairy tale, and now it's time to turn into a phone case that reflects your style. Perfect for school or work! Howl's Moving Castle is one of the best-selling works of author, Diana Wynne Jones. This book has been adapted into three different forms: a manga, an anime series and a live-action film. You can purchase these merchandising items from Howl’s Moving Castle Merch if you’re interested in adding them to your collection.