Lost In Darkness (Naruto)

Naruto was dark-hearted soul that decides to leave Konoha with unknown goals to achieve. Just disappeared into the wind.

Sasuke's focus from Itachi shifts to Naruto as he overhears rumors of his power to stop an entire army of ANBU which is unbelievable but pressure to remain undefeated throws Sasuke into the training dojo under the harsh teaching of Kakashi and Jiraiya. Tsunade tries to reach contact without brutal force but resorts to hiring a certain group to take him down, capture the Kyuubi and transfer it to her in exchange for an insane money loss in Konoha's economy.

But only time (and chapters) will tell whether her methods of capture will turn for the better or worse.