The Spring of the Plague

When Konoha ninja return from investigating one of Orochimaru's laboratories, they bring back a devastating strain of chakra bacterium - Kimimaro's sickness developed into a bioweapon. As Naruto and his surviving friends struggle to live in Plague-stricken Konoha, Madara plots, an anti-ninja cult demands repentance, and, in the midst of it all, Sasuke seeks a perfect revenge.