Now the Akatsuki are coming up and getting more involved. Now its Shikamaru and Asuma vs Hidan and Kakazu. Hidan is immortal and Kakazu has 5 hearts, which practically makes him immortal as well. The Akatsuki are in pursuit of one thing... the tailed beasts. And this time they were looking for Naruto, the nine tails jinjuriki. The reason Asuma, Shikamaru and two other leaf ninja were deployed to fight them was to stop them from coming to the  Leaf village. During this fight asuma was killed by hidan and the rest escaped, team Asuma had lots of grief from this and Shikamaru decided that he wanated revenge. while all of this was happening, Naruto was training to develop a new jutsu.