In a world powered by a revolutionary energy source, life is peaceful for Akane Isshiki and her family on a small island.
However, this tranquility is shattered by the sudden arrival of enigmatic beings called "Alone," intent on destroying the energy source that sustains the world.
Akane is granted a special power, the Vivid System, allowing her to transform and fight back against the Alone.
She teams up with Aoi, Wakaba, and Himawari to form a team of girls tasked with defending humanity from this unexpected threat and protecting the world's energy source.
Together, they must learn to work together and master their newfound abilities to stand against the Alone and save the future.