Mha x ST

You go to UA, and your in class 1A, but one day you keep on getting Visions about this creepy and upside down version of Musutafu, with these vicious monsters, and the class doesn’t think much of it until weird stuff starts to happen, the lights randomly start to flicker, the clock hands start to spin. And (later on in the plot) the same vicious monsters you saw in your vision come out of these portals that, when you look inside you see the same place you visioned. Musutafu Has a world under it. And it’s in yours and your classes hands to stop it from making the world end.