The story is set in a futuristic and peaceful world made possible thanks to the invention of the Manifestation Engine, which solved an energy crisis five years prior. On the island of Izu Ōshima, Akane Isshiki lives a peaceful life with her family. When the world is threatened by an alien force known as the Alone, Akane is given a special key by her grandfather, Kenjirou, which allows her to access the Vivid System, which grants her special powers. Joined by her friends Aoi, Wakaba and Himawari, Akane fights to protect the world from the Alone.