Girls' Frontline is a popular porn video tag that refers to a subgenre within adult animation. This genre is based on the original mobile game "Girls' Frontline," which features anthropomorphic guns with human-like features and personalities. In this context, girls' frontline represents animated content featuring these characters, often engaging in various sexual activities or situations. The tag indicates that the porn video involves these cute and sometimes lewd gun-girls in erotic scenes, catering to fans of the original game as well as those who enjoy anime-style adult animation