After the war, Katniss and Peeta move on. Just not in the way they expect. Post-Mockingjay.
Hermione Granger is lost. Harry Potter is lost. They work to find themselves - and eventually find each other during the journey there.
Hermione finds out that she's a witch, and she's ready to learn more about the Wizarding World. But she gets sorted into Slytherin and quickly learns that it's kill or be killed.
Relationships are full of compromise. Katniss and Peeta know that. Doesn't mean it comes easy, though.