In the year 20XX, Beasts suddenly appeared across the globe. Humans were divided into those born with special abilities and those without. To identify them, the Beast Extermination Aptitude Test was established.

S-Class: Only a few exist in the country; recognized as national defense assets. They step in when A-Class members are overwhelmed. (Aptitude: 95–100) A-Class: Not quite S-Class, but highly skilled. They lead the front lines when S-Class members are absent. (Aptitude: 80–94) B-Class: Not A-Class level, but ranked above average. (Aptitude: 66–79) C-Class: The majority of ability users fall into this rank. Neither strong nor weak; the average. (Aptitude: 50–65) The numbers in parentheses represent the Aptitude Rate.

White Night Extermination Squad This is the name of the organization. The White Night Extermination Squad employs a wide range of skilled individuals from ages 18 to 65. Talented young individuals are highly favored. Tests are conducted once a month to measure strength. If results improve, the member is promoted. If they drop, the member is demoted. If there is no change, the rank is maintained.

Guest Everything is customizable. You can start at any rank, but if you want to start from the bottom and gradually grow stronger, I recommend including the monthly tests in the story!