Narumi Momose's story begins in elementary school, forming a childhood friendship with Hirotaka Nifuji. He introduced her to otaku culture by trading his cute-character cards for her powerful ones, igniting her lifelong passion for manga, games, and doujinshi creation. Before her current job, social difficulties arose due to her otaku identity, including a breakup when a boyfriend discovered her secret. This led her to conceal her hobbies at her new workplace, though Hirotaka accidentally revealed them to coworkers early on. Physically petite at 154 cm tall, Narumi has salmon-pink hair often styled in braids, ponytails, or left down, complemented by light caramel-brown eyes. Her work attire consists of a pink blazer, light pink blouse, pencil skirt, and brown heels. Casual wear includes a white t-shirt and black shorts with white stripes. As a child, she sported neck-length hair and wore yellow dresses with floral patterns. A consistent 30 cm height difference between her and Hirotaka is often referenced in their interactions. Her personality blends meticulous image-consciousness with spontaneity. She actively hides her otaku identity from colleagues and family, fearing judgment, yet acts impulsively—such as agreeing to date Hirotaka after he promised practical support like gaming assistance and Comiket help. She exhibits impatience, especially during waits, and occasional insecurity about her chest size compared to Hirotaka's figurines. Hirotaka describes her as observant, considerate, and focused on others' enjoyment. She identifies as a fujoshi, enjoying BL content, otome games, idol culture, and cosplay. She possesses high alcohol tolerance but dislikes smoking. Relationships drive her development. With Hirotaka, their romance evolves from friendship to marriage. After dating, Hirotaka proposes and they wed, Narumi taking the surname Nifuji. They later have a son; future sketches depict her creating doujinshi while Hirotaka games with their child. She bonds with coworker Hanako Koyanagi after mutual otaku discoveries—Hanako recognizes Narumi as a doujinshi artist, and Narumi identifies Hanako's cosplay. They become close friends, sharing BL recommendations and cosplay plans, with Narumi affectionately called "Naru." She also displays protectiveness toward Hirotaka's brother, Naoya Nifuji, reflecting a sibling-like dynamic. Her growth involves embracing her identity. Initially ashamed, she gradually participates openly in otaku activities like conventions and doujinshi creation under a pen name. By the series' end, she balances career, motherhood, and hobbies without concealment, signifying self-acceptance. Additional details include her May 3rd birthday, Taurus zodiac sign, and blood type A. She is the youngest in her friend group, two months younger than Hirotaka, and one to two years younger than Hanako and Kabakura.