A hidden demon. A Demon with powers that rival his master's. A Demon with control over time and space. A Demon known as Moon Zero. More powerful than the Upper Moons. Older than Kokushibo. This demon was never near death. Until one day, after the assault on the Infinity Castle, two Demon Slayers were sent to kill it when it showed itself. Though the Demon should have died, it managed to do something neither expected. Somehow, they, along with friends current and gone, were thrown through a portal and into a new era. An era where Demons no longer exists. An era where Breathing Styles are not needed. An era... of Heroes. With friends restored and new allies, the Demon Slayer Corps, consisting of just the Hashira, five normal ranked Slayers, and a few others, must find Moon Zero. But in this new era, people can look like anything. A Demon wouldn't be out of place. Will Demon kind be reborn in this new era? Or can the Demon Slayers and the Heroes manage to find and destroy this newest threat to the world? In the shadows, if Moon Zero calls on his name, Muzan Kibutsuji can be reborn...

WARNING: contains spoilers for those who don't read the Demon Slayer Manga Right after the battle of Upper Moon 1, and right in the middle of a battle with Kibutsuji Muzan, a bright light comes out of nowhere and they all black out. Right after the villains attack at the USJ, these strange people come out of nowhere Now the demon hunters and heroes band together to battle against the Upper Demon Moons and the League of Villains (In this, Muichiro, Shinobu, Genya, Rengoku and Oyokata have been brought back to life! How will everyone react to their resurrection? Swear warning!!!) This is my first fanfic so I'm sorry about any spelling errors!! (Characters of My Hero Academia and Demon Slayer do not belong to me)