I'm not sure who Milly Taiden is in relation to this 'milly taiden fantastic fiction'. It could be an author who writes this particular type of fiction.
Overall, Trigun Stampede adheres closely to the manga. Some minor details might differ for the sake of the adaptation's flow and visual presentation, but the core remains the same.
The Trigun manga has a considerable length. It consists of multiple volumes and chapters, but the exact number can vary depending on the specific edition and printing.
Milly Dowler, a girl from the UK, disappeared. The full story involves the desperate search by her family and the police. There were many false leads initially. The revelation about the hacking of her mobile phone brought in issues regarding media behavior and the rights of victims. The case had a significant impact on the public's perception of privacy and media regulation.
It depends. Maybe it's a novel, or it could be a title for something else like a collection of short stories or a poem. We need more details to determine exactly.