The Disappearing Act (гет)

After the battle, Hermione and the rest of her year return to Hogwarts. Things should be easy, perfect even, but Hermione's hiding a secret, one that has the power to completely destroy her. Will she be able to fight her demons on her own, or will she need help from the last person she'd expect? Potential trigger warning - strong themes of anorexia and depression, Fred's alive a/u