Just After School Started, I Announced the Countdown to Global Disaster.

From this day on, night demons invade the world, and those who break the rules will be killed. Since then, there has been a global curfew. Su Cheng, a senior high school student, awakened the system in advance and gained insight into this global disaster. Three iron laws. First: You can't kill all the Night Demons, and you will replenish them as much as you kill. Second: Night demons will appear at seven o'clock in the evening, and all night demons will disappear at seven o'clock in the day. Third: Understand the killing rules of night demons. The killing rules of each kind of night demon are different. Only by knowing all the rules can you survive. Su Cheng, who has the Night Demon System, can deduce all the Night Demon's killing rules, and he can become stronger by killing the Night Demon. Because of him, mankind is no longer in despair, and the order that is about to collapse is under control. Because of him, a militia group was established in the community, and the heroic people turned into demon hunters to protect their homeland together. All mankind has obtained the cultivation method, and the school's seed class has been established. It was because of him that the last piece of pure land was allocated to all mankind. He is God Su, a demon hunter who walks in darkness but brings light to everyone. Remember his name, because if you call him, he will appear. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.