Izuku's Quirk manifest at the tender age of five. It's strange that he would have a fire Quirk given what his mother's Quirk is, but he chalks it up to genetics on his father's side. A week later, there's a (familiar) stranger in the kitchen, and everything changes.

Kakashi was content with his life, content with his death. Until of course, he wasn't dead. Kakashi, now known as Kaminari, must now survive a world full of heroes. And naturally, things don't go quite to plan. bnhaxnaruto crossover cross-posted on ao3