The Note of Red Evil

After the world has gone through the "ancient era" in which monsters are rampant and humans are surviving in the cracks, the "four brave men" who wiped out the monsters divided the world into general areas and established a country at each of the four corners of the continent, and built four high towers, and their respective weapons are placed in it as a sign of peace. It also uses the "energy crystallization" produced by the huge power in the "War of the Ancients" as the main energy use of various countries, and has developed civilization and technology. When the world seemed to be calm again, the terrorist organization "Bai Ling's Key" suddenly appeared, messing around, and using their technology to create a "Bai Ling virus" that allowed ordinary people to gain "superpowers" and spread it everywhere. In order to solve the sudden outbreak of "superpower crime" and to assist the police and help the people, the "Detective Police Special Armed Action Team" (referred to as "Detective Police") came into being. As a very good "Detective Police", Setsuna·Shou gradually became the biggest obstacle to "Bai Ling's Key", and later died in the "Bai Ling's Key" hijacking case. His younger brother Setsuna Sixteen wanted to train for his revenge, but failed in the combat test to join the Kingdom Army, and had to start an ordinary student life that had nothing to do with fighting, "detection police", etc. The story begins here.