Homare Kinoshita is a supporting character in the series, known primarily for being the younger sister of the protagonist, Utage Kinoshita. As a member of the Kinoshita family, she represents a typical perspective from someone outside the intense world of idol fandom. Her worldview is characterized by a "riajū" attitude, meaning she is a socially fulfilled and popular person who lives a rich, real-world social life, putting her in direct contrast with her older sister's devoted, often solitary, obsession with the idol group F/ACE. Because of this, Homare initially struggles to understand Utage's all-consuming passion for the idol Tamon Fukuhara, finding her sister's intense dedication to be quite foreign to her own values and interests.

In terms of personality, Homare is depicted as someone who would rather be the object of admiration herself than spend her time admiring others from afar. She embodies a confident and self-assured demeanor that is typical of a high school girl who is secure in her own social standing. This confidence leads to her initial inability to comprehend why her sister would dedicate so much of her life and earnings to supporting someone else's career. Unlike Utage, who works part-time as a housekeeper to fund her fandom, Homare's priorities are firmly rooted in her own social life and personal image. However, her character is not static. As the story progresses and she is inevitably drawn into the orbit of F/ACE through her sister, Homare undergoes a subtle but notable development. She eventually becomes a fan of the group herself, demonstrating that the allure of the idol industry can even win over a self-proclaimed "riajū." In a twist that aligns with her original preference for being on the receiving end of affection, her favorite member of F/ACE becomes Keito Tachibana, who is often seen as the group's princely and charming figure.

Homare's primary role in the narrative is to serve as a foil to Utage, highlighting the protagonist's unique position as both a super-fan and a close confidante to a troubled idol. While she is not deeply involved in the central plot of Tamon's professional struggles or his complex relationship with Utage, her presence helps to ground the story in a more relatable reality. Through her interactions, the series explores how the world of obsessive fandom appears to an outsider, adding a layer of social commentary and comedy to the household dynamics. Her eventual acceptance and participation in the fandom also serve to validate the emotional appeal of the group and the characters, suggesting that their charm is not merely a delusion of a few dedicated fans but has a wider, more universal resonance. As a secondary character, she enriches the setting of Utage's personal life, providing family-based interactions that contrast with the high-stakes, secret-filled world of professional idol management.