In the year 20XX, personal robots have become an everyday part of human life. Amidst this near-future world, the evil secret organization "Puppet Master" seeks to dominate the globe by weaponizing robots. To protect humanity, a lone angel descends—her name: "Cosplayer." By day, she appears as Nanako Morisaki, an adorable schoolgirl. But thanks to the "Cosplayer System" implanted within her by her creator, Dr. Morisaki, a leading robotics expert, she can instantly transform into any costume, evolving into an invincible warrior. Today, Nanako once again rises to battle and foil the evil schemes threatening the world. Starring Mako Koyuri.