You Are Not a Cultivator Here

My deskmate told me all day long that he was a cultivator of immortality and had a destiny. I always thought he was a chuunibyou, but I never took him seriously. Until that afternoon, it suddenly became dark. There was no thunder or wind, and the whole city suddenly fell into darkness, eerily quiet. The next second, the depths of the sky suddenly exploded—— Nine black dragons circled out, their bodies covering the sky. The black scales glowed coldly, and the dragon's roar shook the whole world. People on the street were all panicked, screaming and running around. My deskmate was the only one standing motionless. He glanced at the sky, and his eyes changed instantly. The school uniform on his body flashed and turned into an ancient robe, his long hair flew, and a spiritual sword fell into his hand. Without saying a word, he jumped up and rushed towards the nine black dragons. I looked at his back and didn't want to hide it anymore. Others panic, but I don't panic. As soon as the breath around me was released, the momentum spread directly. The school uniform also turned into a smart outfit. I raised my hand and made a move, and the dragon shadow belonging to me appeared behind me, facing the black dragon in the sky. He held his sword and fought for nine days, and I followed him with my dragon. He is not the only immortal cultivator in this world.