Reanimated Flame

Recently I've got into the naruto fandom so-

Kakashi runs into trouble during his mission, but there was something strange about this character and ends up getting captured. Naruto hears about this and rushes to save his teacher along with sakura, Neji, and Shikamaru. Who is this person? How powerful is this person to be able to capture the copy ninja? Find out about it all in this very book.

Note: I'm gonna try to attempt kakashi x iruka into this :))

The oc and art used is mine, thanks