G Men, also known as Erohon G-Men, is a recurring female character in Denki-Gai. Her professional background is as a Tokyo Youth Development Counselor, a role that officially tasks her with inspecting commercial establishments, specifically comic book shops, to ensure that merchandise with adult content is properly packed and segregated from other materials according to regulations. Her nickname, G-Men, is a reference to her line of work as an agent monitoring adult publications, and it is the name by which the staff of the Uma no Hone bookstore know her.

In terms of personality, G Men presents a fascinating dichotomy. On the surface, she carries out her duties with the seriousness and authority expected of a public official, approaching her inspections with a professional demeanor. However, her motivations are complicated by a deeply personal interest. In her spare time, away from her official responsibilities, she is an avid fan of the very same pornographic books she is tasked with regulating, with a particular enthusiasm for the Boys Love genre. This duality suggests that her role is not purely a matter of public service but is also driven by a personal passion for the medium.

Her primary role in the story is that of an external authority figure who interacts with the staff of the Uma no Hone comic shop. She is not an employee of the store but a frequent visitor who ensures the establishment is in compliance with youth protection laws regarding the display of adult merchandise. Her inspections are a recurring element, placing her in direct contact with the main cast. The key relationship she has is with the Uma no Hone team, who associate her with her group of "porn book agents" and use her nickname as a familiar form of address. While she holds a position of power over the store, her secret fandom creates an unspoken, ironic connection with the employees, who are also manga enthusiasts.

There is little evidence of significant personal development for G Men within the narrative. Her character is largely static, serving as a consistent source of humor derived from the contrast between her official authority and her private hobbies. Her notable ability, beyond her professional authority as a counselor, is her incredible speed and efficiency at checking through erotic books, a skill that likely stems from both her job requirements and her personal interest in the subject matter. She is identifiable by her physical appearance, which includes black hair that falls to her waist, black eyes, glasses, and a professional attire consisting of a suit, tie, tights, and pumps.