Akimoto Jun appears to be a gentle and cute college girl, but that is merely a facade. Her true identity is a humanoid personal robot, Cyberdoll Number 7790, created through advanced robotics and nanotechnology. Tasked with opposing the evil organization Puppet Master and protecting the world, she was granted special abilities by her creator, Professor Morisaki, a leading authority in robotics. This ability is the Cosplay Drive System, which allows her to change costumes infinitely, enabling her to fight as the heroic warrior "Cosplayer." To save her creator's life, Jun infiltrates enemy territory alone, but is captured by Puppet Master's henchman, Mr. Excuser. He takes control of her bodily urges, forcing her into involuntary excretion. Unable to endure the cruel treatment, Jun's mind begins to break down, and the act of excretion gradually transforms into pleasure. Ultimately, the film depicts Jun joyfully defecating and urinating uncontrollably.