Harry finds himself at King's Cross once more after he's killed Voldemort. There's a screen in front of him flashing 'Game Over'. Seeing the 'New Game' option he considers it. He only makes one wish that his twin sister Violet could play this game with him. Then he starts the game. See what damage the Potter Twins do this time around. Pay attention to tags.

Harry is enamored with The Half-Blood Prince and is trying his best to learn all he has to teach him. Along the way he seeks out help from his least favorite teacher and soon learns the truth.