Nanako Hanasaki hails from the Kingdom of Qi, sharing her hometown with fellow pilot trainee Noriaki Kashiwabara. She trains in Cadoques High's Aerial Division as a member of the Centezual class, serving directly as Noriaki's flying partner. Nanako is characterized by her consistently cheerful nature and tendency to radiate positivity with a constant smile.

Her interactions with Noriaki suggest mutual attraction, hinting at a romantic connection between them. Among their flight student peers, Noriaki is affectionately known by the nickname "Noripii." Nanako participates in perilous aerial missions alongside her classmates. She notably volunteers with Noriaki and Benjamin Sharif for a critical reconnaissance operation; this mission suffers heavy losses, and Nanako narrowly survives.