Hinata relied on Naruto's smile more than she could say. So when it faded due to Sasuke joining the sound, she decided to join too and protect him. Even though she didn't like Sasuke, even though she didn't even really care about Sasuke, she would go through this hell to save him.

With the Fourth Shinobi War over and the dead freshly buried, Hinata, Sasuke, Naruto, Sakura, Ino, and Shikamaru are sent on a mission to a land on the verge of a war of it's own. But unseen wounds from their war still remain.