I Lift the Car to the Rear, but Kill the Devil with One Knife?

[Non-invincible text + decisive killing + ghost hunting + global + 20 chapters of cool flying + brains] After the beast-ghost disaster in 2008, people gradually forgot the existence of ghosts. Do you believe in ghosts? It wasn't until Bai Shaohan died in front of Lin Yumo that he believed it. Do ghosts and angels really exist in this world? Are you admitted to a mysterious academy, where everyone is armed with weapons, and the system is rated as the only "E" in the school? After entering the academy, classmates kill each other? The sudden invasion of ghosts caught everyone off guard. The last person on the crane actually stood at the end. It seemed that something had replaced Lin Yumo's body, and the last person on the crane began to hunt! Ps: The first few chapters will slowly introduce the story background and mechanics, and then the pace will begin to accelerate.