Ryōko Kadoma hires detective Gokū Fūrinji to find her missing brother, Ryū Kadoma. Ryū suffers from a condition caused by genetic experimentation that triggers violent transformations without treatment, compelling Ryōko's desperate search. The investigation faces significant opposition, including military pursuit using robotic hounds, and uncovers a history of genetic experimentation, coverups, and revenge. Ryū, transformed by cruel experiments, becomes an increasing threat as his control slips. Ryōko's personal connection to her brother complicates the mission, forcing her to navigate the uncertain possibility of saving him versus the necessity of eliminating him before his transformation completes. Her role centers on confronting those responsible while grappling with this profound moral conflict.