Setsu and Wakana's feelings diverge concerning Spring Dawn. STC records Stormy Melody, an original song which channels Setsu's frustration over that, and the band achieves its major debut! However, their album goes on sale on the same day as Wakana's second album… What direction will this sibling showdown through the music market take?! Meanwhile, STC contends on a new stage with Seiryu Kamiki and Soichi Tanuma, their worthy rivals who carry the future of Tsugaru shamisen on their backs!!