Ayami Kunimasa is a 21-year-old woman with black hair reaching her shoulders and striking blue eyes. Her typical outfit features detached sleeves, stockings, and fingerless gloves. Born in Nagano, she practiced kendo through high school, achieving a competition level high enough to represent Japan in world tournaments. She enjoys touring on her motorcycle, and her friends call her "Aya."

Aya possesses a strong-willed and busybody personality. She instinctively takes on a mediator role within her group and demonstrates consistent care for others. She serves as a member of the specialized task force Trinary, dedicated to resolving incidents involving self-contained pocket dimensions known as Phenomenon. These false realities overwrite affected areas and can only be dispersed by defeating or appeasing their creators. Within Trinary, she collaborates with teammates to balance everyday responsibilities with mission duties.