By day, Arashiyama Risa works as a kind and gentle doctor, but when an emergency signal sounds, she transforms into the heroic warrior Rystorm, dedicated to defeating evil organizations and protecting the citizens—a figure who has captured the hearts of many. One day, however, Mirage Reika, the arrogant daughter of the powerful Mirage conglomerate, is suddenly kidnapped. Risa immediately transforms into Rystorm and rushes to her rescue, only to discover that Reika herself is the mastermind behind the destructive robot incidents. The Mirage conglomerate had unleashed these advanced robots into the world, declaring they would eliminate anyone who stood in their way. Reika had orchestrated her own kidnapping to lure out Rystorm and drain her powers completely. Though Risa struggles fiercely and ultimately defeats the state-of-the-art destruction robot, Reika appears next, wearing a powered combat suit and attacking with overwhelming strength. Rystorm is overwhelmed and defeated. Instead of killing her, Reika opts to torment Risa relentlessly, determined to uncover the secret behind her powers. This marks the beginning of a twisted game of cat and mouse, leading inevitably to a devastating BAD END that will forever alter Risa's fate.