I'm Your Sinner, You're My Undoing

After the Second Wizarding War, everyone's torn with the huge losses they have suffered, family and friends all reduced to memories. Hermione Granger returns back to Hogwarts for her Eighth Year. However, little did this Muggleborn know that things will be very… different as an young adult. What is there in the world that the brightest Witch of her age didn't know of?