Ayaka Hoshimi is a university student who balances her academic life with work as a part-time model and a social media influencer. She is part of the main trio of characters from the Sorairo Utility series who appear in the crossover mini-anime, where her presence adds a layer of resourcefulness and external polish to the group dynamic. Her approach to life is defined by a duality between her public persona and private insecurities. As an influencer, she projects a confident, polished, and aspirational image centered on golf, using her platform to share her experiences and motivate herself to play. However, internally she grapples with imposter syndrome, fearing that her relationship with the sport is superficial compared to the genuine, raw passion displayed by her friends. This vulnerability is visually represented in moments where her face is intentionally obscured during episodes of self-doubt on the golf course.

Within the narrative of the collaboration, Ayaka acts as a connector and a catalyst for the other characters. She recognizes the golfing potential in Minami Aoba, a beginner searching for purpose, and actively works to support her development. Demonstrating her pragmatic and generous nature, Ayaka arranges part-time job opportunities for Minami to help her afford necessary equipment. Her role is further illustrated through a specific challenge where she engages Minami in a competition at a driving range, promising a lucrative job if Minami wins. Although Minami loses the contest, Ayaka honors the spirit of the agreement by inviting both Minami and their friend Haruka Akane to participate in a golf apparel modeling shoot. This experience helps broaden Minami's horizons and subtly builds her confidence, with Ayaka offering reassurance that personal growth is a gradual process. Her interactions also introduce lighthearted moments, such as her confusion when Minami buys everyone red bean drinks based on a mistaken belief about golfer preferences.

Ayaka maintains close friendships with Minami and Haruka, forming a supportive trio known by the acronym HAM. Their bond extends beyond the fairways to include social activities and shared work experiences. The character undergoes a subtle but meaningful development arc that involves reconciling her public identity with her private enjoyment of the sport. She eventually comes to realize that her actions, including sharing her golf journey online, genuinely reach and inspire others. This validation helps her overcome her insecurities, affirming that her own approach to golf, while different from her peers, is equally meaningful. Her abilities on the course emphasize strategic thinking and adaptability over raw power or natural athleticism. She employs cunning tactics and clever maneuvering during play, which suggests a cerebral and calculated style that distinguishes her from Haruka's athleticism and Minami's earnest beginner efforts.