Every year, these people gather together 12 women in the college to conduct a cult like ceremony at this time point. The content of the ceremony is BF battle, and the male object selected as BF is called sacrifice. In fact, the unified examination is just a harmless excuse. In fact, it is to support students and thus operate The whole ceremony. Because there is only one sacrifice, the twelve women are “baptized” in the form of checkpoints. Finally, the women who have successfully drained the sacrifice will become the chosen people in the ceremony.