Hatake Kakashi should be a person with a lot of stories.
I haven't finished watching Naruto, so the timeline is arbitrary. Although it is the original background, it will change a lot of directions.
The male protagonist can play cheats. After all, Kakashi was described as strong in the early stage but was weakened in the later stage because he was not the protagonist. So in his own story, he should be a strong one.
The heroine has a golden finger, because I hate the weak and good-for-nothing heroine who will only be saved by others. I prefer a heroine who can stand shoulder to shoulder with the hero.
This is a very imaginative story, a story about Kakashi that has not been mentioned in Naruto. It is a story that was once so close, but now there is no way to return.