Megumi Chihaya is a twenty-year-old temporary employee in the Welfare and Benefits Office Department of the Mitsuba Ward Office. She has straight shoulder-length auburn hair with bangs parted at the center and two dark yellow hairclips, and reddish-brown eyes. She serves as a senior coworker to the new recruits, particularly Lucy Yamagami, and is often assigned to window work where she efficiently redirects citizens to the appropriate departments.

On the surface, Megumi appears aloof and low-key, maintaining a calm and collected demeanor at work. In reality, she is a devoted fan of the magical girl series Magical Flowers and an enthusiastic cosplayer. She frequently wears her cosplay outfits underneath her work clothes and prioritizes attending fan events, a key reason she chose temporary employment with shorter shifts. Her personality is blunt, cynical, and pragmatic, but she is also a highly reliable and knowledgeable worker who understands office dynamics better than most.

Her primary motivations center on preserving her personal hobbies while fulfilling her job duties, and she maintains a discreet romantic relationship with her supervisor, Taishi Ichimiya. This relationship is kept secret from their coworkers for much of the story, adding a layer of personal complexity to her professional life. She is also protective of her interests; for instance, she becomes fixated on using Lucy as a model for her handmade costumes, viewing Lucy's appearance as ideal for her cosplay projects.

In the story, Megumi acts as a stabilizing presence within the office. While eccentric colleagues like Yutaka Hasebe and the energetic Toko Ichimiya create chaos, she provides a grounded, rule-oriented counterbalance. She mentors Lucy in navigating the workplace, often with a dry, straightforward manner, and she helps Saya Miyoshi learn to speak up for herself. Her relationship with Taishi develops gradually, with both characters navigating the challenges of keeping their partnership hidden, especially from Taishi's overprotective younger sister, Toko. Throughout the series, Megumi's character remains largely consistent, but she shows growth in her willingness to involve herself in her coworkers' personal lives and in her subtle efforts to integrate her two worlds—her public role as a civil servant and her private identity as an otaku. Her notable abilities include her efficiency at customer service, her skill in cosplay costume creation, and her sharp understanding of office politics that allows her to navigate the quirks of her colleagues with minimal drama.