Taku, a boy who remembers everything he sees, keeps his head down to avoid mental overload. Only music offers him relief, so he often hums to clear his mind. His classmates Mick and Yoji join in with raps and harmonies, forming a playful trio. One day, they’re confronted by a gang led by the feared Ganaha Ryu. Just as things escalate, Taku’s father and his twin brother appear—and inexplicably, a rap battle begins. Ganaha Rui, Ryu’s younger brother, outshines everyone, and Taku’s attempt is mocke...