Alyu Lux, a spirited rhythmist in the king’s military, travels alongside her shy younger sister Monica, channeling music to bolster troop morale. Driven by a fierce determination to fund a cure for their mother’s blindness, the sisters collaborate with Rin, whose Song of Healing—aided by Monica’s involvement—finally restores their mother’s sight. With their goal achieved, Alyu and Monica abandon military service to journey toward the capital with Rin’s group, embracing new purposes beyond wartime duties.

Courageous and fiercely protective of Monica, Alyu’s boldness and outspoken charm starkly contrast her sister’s quiet reserve. Her confrontational streak often ignites disputes, yet she equally intervenes to mediate others’ conflicts, balancing impulsiveness with a pragmatic desire for resolution. A master of improvised percussion, she conjures vibrant rhythms by striking surfaces at hand, rarely relying on conventional instruments.

Her crimson hair, fiery eyes, and youthful freckles mirror her vibrant energy, accentuated by practical combat gear—a sleeveless vest, bra, and trousers—that contrasts Monica’s subdued attire. Alyu’s past includes abandoning ambitions for the Court Orchestra to prioritize family, a sacrifice underscoring her unwavering loyalty. Her story remains anchored in familial devotion, without documented expansions in secondary media or spin-offs.