In the last few chapters of Naruto Shippuuden, Naruto has been training to overcome the Kyuubi. He trained with Hachibi, and has met his dark self. As he faced the Kyuubi, he met his mother and shared thoughts. His mother has help him a lot in collecting himself, which is the best way to defeat the Kyuubi. As Naruto defeats the Kyuubi, Kushina revealed that she was the previous host of the nine-tailed fox.