Aftermath: From the Author's Point of View
Sakura Haruno died on September 11, 2009. She wrote the letters from the other side on January 1, 2010. Sasuke Uchiha was sent to Konoha's most secure prison on September 20, 2010. Naruto Uzumaki started training for the position of Hokage on December 2, 2010. Tsunade was indeed killed by Orochimaru on September 11, 2008 only a few hours before Sakura died. The letters were found on April 23, 2012. The story begins again.
The End