Kakashi knew that because he was a ninja that there was a chance of him dying...it's just that, well you see, Team 7 the last alive human on Earth was fighting Madara when he tripped over his porn, broke his neck and died.

Kakashi Hatake, the Rokudaime Hokage closes his eyes as his life fades.... WAIT WHAT HAPPENED!!! Then next thing Kakashi realizes is that he is alive and he's twelve years old again >>DISCONTINUED<< People can adopt this story if they want