In this futuristic world, a peaceful existence is maintained due to the invention of the manifestation engine that resolved an energy crisis five years ago. on izu oshima island, akane isshiki leads a serene life with her family. however, when the threat of extraterrestrial forces known as alone looms over the world, akane receives a special key from her grandfather, kenjirou, that grants access to the vivid system, bestowing upon her unique abilities. alongside her friends aoi, wakaba and himawari, akane embarks on a quest to safeguard the planet from the alone.