Mha x ST

You are a student at UA, class 1A, and you and your class are doing (whatever you want idk) you keep on getting visions of this weird and scary world under where you live. The class doesn’t think much of it.but weird stuff starts to happen. Lights flicker. Clock’s hands start spinning. Later on the class finds out There’s another world under Musutafu. And it’s upside down. That you can only get inside by going through a portal Filled with murderous monsters known as demigorgions (idk how to spell it) (you can choose your quirk, looks, gender!)