Sayonara Wild Hearts is a musical rhythmic action game with a third-person view. When the heart of a young girl breaks, the balance of the universe collapses. A diamond butterfly appears in her dreams and leads her along the sky highway, where she finds her other «I»: a masked biker nicknamed «The Fool». Traveling through futuristic cities, dark forests and electric deserts, she tries to find the harmony of the Universe hidden in the hearts of Little Death. When the young girl’s heart breaks, the balance of the universe is broken.