In a futuristic age, the Manifestation Engine effectively tackled an energy crisis, leading to a peaceful era on Izu Ōshima, enjoyed by Akane Isshiki and her loved ones. Nevertheless, the planet is under threat from extraterrestrial peril referred to as the Alone. Akane's grandfather, Kenjirou, grants her a unique key that unlocks the Vivid System, empowering her to combat the Alone and protect the world alongside her allies Aoi, Wakaba, and Himawari.