Macy Kramer emerges as the protagonist’s chief rival, balancing her duties as class representative with her status as the sole heir to the Kuroha Group, a corporate empire led by her absentee tycoon father. Her wealth cultivates a brash, superiority-driven persona, marked by frequent boasts about her lineage and luxuries—traits that alienate peers, who dismiss her as a meddlesome gossip.

She fixates on the protagonist as a romantic adversary, convinced they aim to poach Takuma Mushanokoji, the school’s revered tennis ace. This paranoia fuels her competitive zeal, though Takuma’s apathy ensures her affections remain one-sided. Parental neglect confines her social world to two exotic companions: a pet alligator and octopus.

A flair for technology surfaces in her command of advanced aircraft, from hot air balloons to airships, which she pilots with calculated expertise. While typically antagonistic, she sporadically shifts tactics during emergencies, leveraging her skills to assist group survival efforts.

Documented accounts confine her arc to the central narrative, offering no expansion into spin-offs or supplementary media.