The genius isn't that they're idols who are secretly heroes. It's that the screaming crowd doesn't know their cheers are literally powering the defense of Earth, turning fandom into salvation without the fans ever realizing. Every live performance carries the weight of a real battle, which means every song has to hit twice as hard, once for the audience singing along, once for the people about to die if the music breaks. The show builds a world where the most vulnerable thing you can do (perform in front of thousands, expose yourself completely) is also the only thing that saves anyone.

Yosuke leads SI-VIS, a co-ed music group turning heads around the world with remarkable singing and stage shows. What the crowds don't know is that every concert is a battlefield. The members are secretly heroes fighting a mysterious force that threatens to destroy the world, and they turn the energy of their live audiences into the power they need for combat. To the public, these battles look like ordinary concerts, which keeps the group's true identity hidden. The show blends action, music, drama, romance and science fiction.