In a world where music is woven into every aspect of life, a young girl named Rin suddenly loses her melody. This threatens to destroy her harmony with those around her, plunging her into a deep silence. Confused, Rin sets out for the distant city of musicians in search of someone who can restore her melody. There, she encounters the Sunset Maestro — a mysterious figure who steals melodies from those who have lost hope in life. To reclaim her melody, Rin must find the strength to create a new one, blending her fears, dreams, and past mistakes into a song of her own.