Fallen Leaves

The invasion has gone horribly for the Leaf. In a single day, most of the village has been wiped out. Powerful Jonin and neophyte Genin alike have fallen on the field of battle in defense of their home. The Konoha 11 has escaped the carnage, and must now pick up the pieces. Who is this enemy? What should they do next? And... where is Naruto? (Rated T, may change. Features OCs)