Multiverse, Starting by Creating Delta of Fate

"How could this be?" Medea turned back again. The enormous boar suddenly raised its head and let out an earth-shaking roar. It was not the cry of a pig... but a thunderous dragon's roar! It lifted its forelegs and stomped down hard several times. The entire academy, the entire Miyamasu District of Fuyuki City, shook violently! Hachiman Hikigaya's pupils dilated. Blood streamed from all seven of his orifices, and his eardrums had completely ruptured. That roar had nearly shaken him to death alive!