Fifteen-year-old Ayu Kawahara attends high school alongside her close friend Kotori Haruno and shares membership with her in the tennis club, where tennis stands as one of her primary hobbies. Karaoke fuels another significant passion, demonstrating her enthusiastic engagement with music. Ayu actively pursues an ambition to become a professional singer, dedicating herself to this musical goal. The player character supports her by assisting with audition preparations, emphasizing a collaborative dynamic in her narrative. Encounters frequently occur during the player’s explorations of Sapporo, particularly at locations tied to her interests. Her energetic, sociable personality emerges through tennis club activities and karaoke participation. Ayu consistently prioritizes her friendship with Kotori and her musical aspirations throughout documented events.