Ayu tends bar at Snack Marry, managed by Mari Aragaki. She embodies a ganguro or gyaru fashion aesthetic, sporting distinctive clothing and artificial tanning. While her precise age is unspecified, contextual evidence places her at approximately 20 years old, considering Japan's legal drinking age and her portrayal as mature yet youthful within her bar employment. She maintains a professional working relationship with Mari Aragaki as her employer. Her story unfolds solely within the main series.