In This Hogwarts Without the Big Four

When Hogwarts ceased to be divided into houses, and the Big Four were forgotten over time, the entire wizarding world has undergone earth-shaking changes since that day. Wizards are no longer subject to the yet-to-be-established Secrecy Law, and Muggle nuclear bombs are aimed at the prosperous magic schools. Noble purebloods will no longer be regarded as an honor, and mediocre Muggles will no longer be looked down upon. In this new era, "coexistence" has become a topic that everyone must think about. Aegon Norman, who had traveled through time, looked at a broken hat singing a nursery rhyme among the ruins and fell into deep thought.