Nana Mitsuhashi is a middle school student attending the same school as the main characters in the period leading up to their graduation. Her background includes participation in athletics, specifically track and field, forming part of her identity within the narrative. She is visually characterized by a ponytail hairstyle, reflecting her active and sporty lifestyle. As a teenager, she shares the central protagonists' age group and experiences navigating the challenges of their final middle school days and the transition beyond.