A Stone's Throw from Heaven, Yet No Way Home

Hatake Kakashi must be someone with quite a story to tell.

I haven't finished Naruto, and the timeline is all over the place. Although it's set in the original world, many plotlines will be changed drastically.

The male lead will have a cheat, because Kakashi was described as being so strong early on, only to be weakened later because he wasn't the protagonist. So in his own story, he ought to be a strong man.

The female lead will have a golden finger, because I hate good-for-nothing female leads who are weak and can only wait for others to save them. I prefer female leads who can stand shoulder to shoulder with the male lead.

This is a story with a wildly imaginative premise, a story about Kakashi that was never mentioned in Naruto. It's a story of two people who were once within reach of each other, yet ended up separated by a world of distance, with no way back.