The Ultimate Demon Slayer, I Become Invincible by Killing Demons

After Ding Quan, who was originally a bully, was replaced by a time traveler from Blue Star, he gained a demon-killing system. The progress of martial arts can be improved through the killing value, and the killing value can be obtained by killing demons. In this world where the human race is declining and the demon race is in power and feeds on humans, Ding Quan relies on the demon-killing system to show his long sword to the monsters that are eyeing him from all sides. This time, he will definitely rely on the system to gather his personal power and kill the demon clan in the world with fear! Kill until all the demons surrender! Don't dare to use humans as food anymore! No matter who demon saint is sitting on the sky, I will chop it with my sword.