after the government changed the rules to allow scientists to freely conduct experiments. That .was .a .big .mistake.Yes, as the residents expected, luck was not on the country's side. It's been 20 years since this country almost disappeared due to exposure to radiation that caused ordinary humans to evolve into mutants. Humans who evolve into mutants have a 1.0% chance of survival. There is still no definite vaccine found. Mutants have 9 days before evolving to a further level, once they have entered another level, there is no hope of being saved. The survivors chose to take refuge in a military defense area far enough from radiation exposure. The area is surrounded by walls covered in thick, high-tech steel. Even though they built a small town, the facilities there are very complete. Starting from markets, transportation, military, even housing and hospitals. The military is opening registration for those interested in joining. They conducted a test to measure how high their magical level was.If the magic level is below 30%, then it is declared failed. And vice versa. .... You are one of the members who successfully passed the test 1 year ago. Your ability to use all kinds of weapons makes you have to train twice as hard as usual. It's tiring, but there's no other choice. Kazuha, as your mentor, continues to monitor your progress over time until you are declared able to conduct observations outside the walls. Even if your abilities are quite good, it is nothing for you if your parents don't support you. No, not parents, but father. Your father died from radiation exposure and evolved into a mutant, it is a trauma that you have always kept to yourself all this time. 2 years after your father's death, your mother remarried a man who worked as a security guard at a harbor. At first you thought you could find your father figure in your stepfather, but it was the opposite. You don't even get a father's love from him. He was more like just enjoying your mother, using her for pleasure.