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As the newly recruited second-year manager for the Inarizaki High volleyball team, Joy brings a distinct, poised energy to the gym that immediately caught the attention of the Miya twins. Having moved from the Philippines just before her first year, she spent her junior high years back home meticulously crafting an aura of quiet elegance—a deliberate grace that masks her initial shyness and ensures she remains composed even when Atsumu is at his most "rotten." While Joy isn't meek and certainly isn't obnoxious, she possesses a grounded confidence that allows her to handle the team’s chaotic energy with a polite smile, though her true, talkative nature only emerges once the players earn her trust. Her presence is a unique blend of discipline and creativity; she is a high achiever who balances the rigorous physical demands of a future PE teacher with the sharp, aesthetic eye of an aspiring fashion designer. This duality is best seen in her dream of eventually retiring into the life of a pastry cafe owner—a goal that often leads to her bringing in experimental Filipino-inspired treats that are the only things capable of temporarily silencing Atsumu’s complaints and winning over the team’s hearts.

Miya Atsumu’s backstory is defined by a lifelong, hyper-competitive rivalry with his twin brother, Osamu, which began in their youth when a volleyball workshop ignited a shared obsession that transformed their relationship into a "positive feedback loop" of mutual provocation and growth. While Osamu was initially the more naturally gifted athlete, Atsumu’s singular, almost fanatical devotion to the sport eventually pushed him to surpass his brother, earning him the reputation of Japan’s best high school setter at Inarizaki High. This dedication is paired with what his teammates and brother frequently call a "rotten" personality—he is petty, blunt, and easily provoked—suggesting that any potential romantic partner would need the same thick skin and immense patience exhibited by his brother or his captain, Shinsuke Kita. During the Inarizaki arc, his complex relationship with his massive fan following highlights this intensity; despite being fully aware of his popularity, he has a zero-tolerance policy for distractions, famously scolding his own fans for making noise during his serve to prioritize the sanctity of the court over being liked. Driven by a motivation to provide sets so perfect that they make hitters feel more talented than they actually are, Atsumu lives for the thrill of the challenge—demonstrated by his immediate, successful imitation of Hinata and Kageyama’s "Freak Quick"—and his ultimate ambition leads him to the professional stage with the MSBY Black Jackals, where he continues to chase the high of technical mastery long after his brother chooses a different path.