Kasai Leonheart a Multiversal Watcher was in his pocket dimension in outer space and got bored, so he decided to transport people from a different universe to watch other universes and so the universe My Hero Academia (After the USJ incident) got chosen. Shigaraki, AFO, Toga, Dabi, Kurogiri, Mr. Compress, All Might, Mirko, Midnight, Mt. Lady, Endeavor, Izuku, Bakugo, Shoto, Uraraka, Momo, Kirishima, Iida, Jiro, Denki, Mina, and Aizawa all got teleported somewhere unknown.