but it's a 表示する about a school that teaches kids not only education in subjects but in weapons mostly firearms and the main character is the daughter of a noble and is so good at weapons(katana's, handguns) that every criminal she's chased after which is 99 currently she has captured
then she meets a boy(guy main character) and he is the only one who she couldn't beat cause he has a mode that makes him an s-rank または higher(the school 閲覧数 how good あなた are によって ranks, the girl is a s-rank while the boy hides his power till a critical situation then becomes an s-rank または higher
