A Second Chance At Life? I Didn't Want It!

Harry died at the age of 280 as a Headmaster of Hogwarts. He'd lived a lonely and unhappy life after the war and Voldemort killed everyone he'd loved, and he was prepared to meet them again in Heaven. But a lady takes his soul after he dies and sends it to the past, saying something about 'a second chance at happiness'. Now, he must vanquish Voldemort again. Better summary inside.