Haruka Amami is a central figure in her narrative, recognized as the main heroine and a key member of the 765 Production talent agency. She is depicted as an optimistic and enthusiastic young woman with a genuine love for singing and a dream of becoming an idol that she has held since childhood. Her personality is notably bright and friendly, making it easy for her to build rapport with almost anyone she meets, which has led to her being affectionately described as a very normal, all-around good girl. Despite her cheerful and hardworking nature, Haruka has a pronounced clumsy streak, frequently tripping and falling on flat surfaces without any apparent cause, a trait she often acknowledges with good humor.

Haruka comes from a close-knit and cheerful family, living with both her parents in Kanagawa Prefecture, which is located a considerable distance from Tokyo. As a result, she often commutes into the city using the first morning train to fulfill her work obligations. In her free time, her primary hobby is baking sweets, particularly cakes and cookies, which she enjoys bringing to the office to share with her fellow idols and the staff. She also likes singing karaoke and having long conversations on the phone with her friends. Her family background and the value she places on togetherness contribute to one of her central fears, which is being left alone or feeling isolated.

Within the story, Haruka serves as a unifying presence and a pillar of emotional support for the other members of 765 Production. Her natural charisma and ability to empathize with others allow her to act as a team leader, often encouraging her peers and helping them overcome personal and professional challenges. A significant aspect of her role involves her relationships with the other idols, particularly Chihaya Kisaragi. Haruka’s persistent kindness and refusal to give up on Chihaya during a personal crisis is a major turning point, demonstrating her deep care for her friends and her determination to keep the group together. Haruka also shares strong bonds with Yayoi Takatsuki and Makoto Kikuchi, with whom she forms a unit called Perfect Sun. Her relationship with the producer is also crucial, as she looks to them for guidance while also providing significant moral support in return.

Throughout the narrative, Haruka undergoes notable development as she matures from a somewhat inexperienced but eager girl into a resilient and accomplished idol. Her journey is not without moments of profound self-doubt and fear, particularly when faced with crises that threaten her friends or her own career as an idol. A key moment in her development involves facing her fear of loneliness after the producer is injured, which forces her to find inner strength and reconcile her vulnerability with her role as a source of strength for others. While she can initially feel burdened by leadership responsibilities, she grows to embrace her role as an emotional core of the group, using her unwavering positivity to lift the spirits of everyone around her. As an idol, Haruka is not initially portrayed as the most technically gifted singer or dancer, having faced criticism for both, but her greatest strength lies in her expressive emotional delivery and her powerful bond with her audience, which she uses to inspire and connect. Her other notable abilities include her strong social intuition and her talent for baking, which she uses to foster a warm and collaborative atmosphere at her agency.