SI-VIS: The Sound of Heroes  

SI-VIS is a musical ensemble comprised of both male and female members, headed by Yosuke. They are renowned for their potent singing voices and performances that have garnered significant attention not only in Japan but also globally. However, what many people are unaware of is that these musicians are secretly battling against a perilous calamity that poses a grave threat to our world. By harnessing the power of their live performances, they clandestinely engage in this covert struggle. To the general public, their fights appear as ordinary concerts.