Nakazawa, known as "Naka," starts as a hot-tempered junior high delinquent whose abrasive demeanor and defiance of authority ignite clashes with the protagonist. Repeated interactions gradually temper her hostility, forging a bond that evolves into fierce loyalty and admiration, marked by her adopting the nickname "Captain" for the protagonist.

The manga charts her exit during high school after joining the basketball team, while the anime extends her arc through continued involvement in the volleyball team alongside the protagonist and Midori. Both versions trace her transformation from combative outsider to integrated teammate, showcasing a mellowing temperament and commitment to group dynamics that replace her earlier delinquent tendencies.

Prone to physical outbursts and fiery confrontations requiring mediation, Naka’s rough exterior masks a bedrock loyalty and instinct to protect others. This emerging sense of justice drives her to shield teammates from threats, balancing residual assertiveness with growing camaraderie. Her narrative arc frames a journey from volatile antagonist to dedicated ally, retaining traces of her spirited intensity while embracing collaborative purpose.