Ayaka Hoshimi is a university student who balances her academic life with work as a part-time model and a popular social media influencer. She possesses a gentle and pleasant demeanor, which complements her polished, public-facing image as a reader model and an online promoter of golf for a casual female audience. Despite her outward confidence and stylish appearance, which often includes a ponytail and visor, she grapples with private feelings of insecurity, specifically a form of imposter syndrome. She worries that her own connection to golf, which she largely shares online as a source of motivation, might be seen as superficial when compared to the genuine, heartfelt passion demonstrated by her close friends.

Her role in the story is primarily that of a catalyst and a connector. Through her friendship with Haruka Akane, she becomes aware of the main protagonist, Minami Aoba, and immediately recognizes Minami's latent talent for golf. Ayaka takes a proactive and resourceful approach to supporting Minami, most notably by arranging part-time job opportunities to help her afford the necessary equipment and practice fees. She challenges Minami to a competition at a driving range, and even though Minami loses, Ayaka honors the spirit of their agreement by inviting both Minami and Haruka to a paid modeling shoot for golf apparel, thereby broadening Minami's horizons and providing a crucial confidence boost. Her interactions often involve gently pushing Minami toward new challenges while offering pragmatic, behind-the-scenes support.

Ayaka maintains close and distinct friendships with both Minami and Haruka, forming a central trio often referred to as "HAM". Her relationship with Haruka appears to be a long-standing one, and she shows a particular fondness for Minami, often doting on her and looking out for her well-being. Her character development revolves around reconciling her public identity with her private self. Throughout the story, she overcomes her self-doubt by realizing that her actions, including sharing her golf experiences online, genuinely reach and inspire others, affirming that her unique approach to the sport is meaningful even if it differs from her peers'.

In terms of abilities, Ayaka's approach to golf emphasizes strategic thinking and adaptability over raw power. She employs cunning tactics and clever maneuvering during play, which contrasts with Haruka's athleticism and Minami's earnest, beginner efforts. Beyond the course, her notable skills include her wide knowledge of golf, which she uses to create content aimed at making the sport more accessible to women, and her social media expertise, which helps fund and promote her friends' activities. She is also said to be a passionate tea maker, crafting blends intended to sharpen a golfer's focus.