Guts is purely fictional. It's a concept or character that exists within the realm of imagination and creative storytelling rather than being based on reality.
The appearance of a science fiction story on AMV is unpredictable. It could be anytime based on factors like the creator's inspiration, available resources, and audience demand. So, you just have to keep an eye out for it.
I'm not entirely sure specifically about a 'k return of the king amv story' as the 'k' is a bit unclear. It could potentially be an AMV (Anime Music Video) related to 'The Return of the King' from 'The Lord of the Rings'. Maybe it's a fan - made video that tells a condensed or unique version of the story from the movie, highlighting key moments and characters with the help of music and visual editing.
Well, Naruto might be really confused at first. He's from his own world and an AMV (Anime Music Video) fanfiction is a very modern and fan - created concept. He could be intrigued by the different interpretations of his story or his friends' stories in the fanfiction.