Kaoruko Takanashi is a sixteen-year-old first-year student at the Kirishina Science and Technology Academy's upper secondary school. As a member of the advanced development program A-TEC, she is the youngest girl on the team. Her primary role is that of a communications operator and assistant. During prototype test flights, she handles all communication duties. In her daily work, she serves as an assistant to the engineer Makoto, where her responsibilities include managing the ordering of materials and supplies.

Kaoruko is characterized by a notably timid and gentle personality. She has a delicate constitution, and the combination of her soft-spoken nature and physical fragility causes her teammates to cherish her as a kind of mascot for the group. No information is available regarding her specific motivations for joining A-TEC, her personal growth and development throughout the series, or her key relationships with other characters beyond her role as the team's assistant and operator. No information is available about any notable or unique abilities she may possess.