Hans, a strict enforcer of the Harmony System, is renowned for his unflinching dedication to the rules. He believes in the perfect order of society, guided by E.I.D.O.S., an all-seeing AI that defines the boundaries of emotion and thought. His world begins to unravel when he finds a child with a Harmony Quotient (HQ) of 0—deemed an unfixable anomaly and sentenced to termination. For the first time, Hans hesitates, haunted by the child’s innocence. Alongside this, his growing relationship with Lira, a composer who creates music designed to stabilize HQs across the city, forces him to confront his own emotions, blurring the line between love, duty, and the fragile humanity he thought he had abandoned.