A group of young people with the ideal of saving the world practiced martial arts in the Assassin Academy, hoping to complete the academy trials and leave the academy to do justice. Han Xiaochu, the top-ranked girl, got the first chance to take the trial. She was about to graduate, but was disturbed by her lazy and useless classmate Long Bixie and failed in the final trial. Then, a series of horror events happened: the trial suddenly turned into a life-threatening hunt, the useless Long Bixie was actually a master of martial arts, and the people chasing them were teachers in the academy. When Han Xiaochu woke up after escaping death, she found that Long Bixie, the only one she could rely on, had mysteriously disappeared.