Hitomi Nishifuji is a first-year student in the general career track at Takebe Gakuen High School. She is one half of the Nishifuji twins, being the younger sister of her twin, Yuka Nishifuji. The pair are known for being part of Murai's close circle of friends, often serving as a form of protective entourage around him.

In terms of personality, Hitomi has a strategic and resourceful mindset. She is also deeply passionate about craftsmanship, particularly in the field of costume design and cosplay. This hobby is a major part of her character, having created an impressive collection of over two hundred different outfits.

These traits directly influence her role in the story. Hitomi uses her strategic thinking to support Murai's unusual situation. Notably, she suggests that Murai, who bears a strong resemblance to the fictional character Hitotose, should run a booth at fan conventions where amateur comics and related goods are sold. This action demonstrates her proactive nature in navigating the comedic and complicated circumstances of the plot. Her key relationships are primarily defined by her bond with her twin sister, Yuka, and her loyalty to Murai as a member of his inner circle.

Her notable ability is her talent for making costumes, a skill she has developed extensively over time.