Gas Mask manages the KADOKAWA men's comics section at a bookstore. He wears a full black gas mask obscuring his entire face, functioning as a deliberate visual extension of his personality rather than practical equipment.

His communication remains blunt and stern, frequently projecting an uptight demeanor. Despite this stern exterior, he maintains a pleasant presence that commands respect from coworkers, who actively seek his valued opinions. The gas mask symbolically amplifies his stoic and cynical essence, echoing his uncompromising approach to work and interactions.