Princess Celestia, searching for Twilight Sparkle and the rest of the missing ponies, approaches the Tree of Harmony to see if she can find any clue as to where all of them went, only to be ambushed by the remnants of Nightmare Moon, seeking revenge after her defeat. In an odd twist of fate the two are pulled into a brand new world, full of heroes and villains with all sorts of powers, Quirks, though both figures end up separated from each other in the land of Japan. Celestia ends up in the care of Inko Midoriya with Izuku as her brother, while Nightmare ends up in the care of All For One with Shigaraki Tomura as her brother.
Both must deal with their own Quriks and the school that teaches students on how to become heroes, all while facing those that seek to bring them down.
(MLP/My Hero Academia)
(Part of the Demon War series)
(Will not be covering the Final War Arc.)