You can start by finding a reliable source to access the Trigun manga. This could be through online manga platforms or buying physical copies from bookstores. Then, just sit back and enjoy the story!
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.
I'm not sure specifically about a 'Roberto Rat' sad story. It could be a made - up or very specific story within a certain community or personal creation. Maybe Roberto Rat was a little rat who got lost in a big city and couldn't find his family. He searched everywhere, in the dirty alleys and under the big buildings, but all in vain.
One characteristic is that it often contains romantic or more sensual elements related to the characters of Trigun. It may focus on relationships between characters like Vash and other main characters in a more intimate way.