Rika is a Silhouette scientist developing robots controlled by human thought, originally intended to assist humanity. These Silhouettes become dangerous when corrupted by lustful human thoughts. Rika and her colleague Sandy investigate individuals exploiting this technology for sexual crimes, leading them into direct confrontations where they themselves become victims of the compromised robots.

To better face these threats, Rika undergoes combat training with Sandy to enhance her physical capabilities. This preparation becomes crucial when Sandy is captured and assaulted by criminals misusing the Silhouettes. Following Sandy's disappearance, Rika launches an investigation to find her colleague and uncover potential espionage within their government-affiliated research organization.

The core Silhouette technology allows human operators neural-linked control, enabling them to experience the robots' sensory feedback, including pain and pleasure. Antagonists exploit this connection to inflict non-consensual experiences upon victims.