Yuuko Yoshikawa, a third-year high school student and dedicated trumpeter, leads her concert band as president. Her chest-length brown hair, green eyes, and school uniform—accented by knee-high socks and a hairbow—reflect her poised demeanor. Born April 15 under the Aries sign with blood type B, she balances assertiveness and empathy in her role.

As president, she navigates responsibilities with approachable leadership, proactively addressing members’ concerns. While preparing for a pivotal concert, she collaborates with peers to explore their aspirations and choices, particularly those shaping their futures. Partnering with Natsuki Nakagawa, the band’s vice-president and fellow euphonium player, she discreetly observes tensions between two central figures, seeking subtle ways to mend their rift.

Yuuko and Natsuki share an unwavering camaraderie, their synchronized presence in group scenes—marked by physical closeness and aligned framing—underscoring their unity. This cohesion starkly contrasts the emotional gaps between other characters, reinforcing their role as stabilizing forces within the ensemble.