Board Thread:Naruto Discussions/@comment-25139119-20140715134049/@comment-17623-20140715140022

One could argue the void of nothingness.

But that is unnecessarily cruel, especially after the way Naruto and his mother parted ways. So I like to believe Kushina did move on to the after life, to reunite with the half of Minato that didn't get stuck in the shinigami.