Shizu Shidaka (17), a high school boy who loves Rock, was harboring frustration with his uneventful life in the countryside. One day, he sees a live performance by his beautiful classmate, Hibiki Raibaru, and receives an unprecedented shock. Through their beloved music, the two cross a line———. A boy with a guitar in his hand and a girl who makes her soul resonate. Their "Ultramarine Rock-n-Roll" begins!! Racing through the great nature of the Tateyama Mountain Range as the backdrop———