SHADOW begins to replace human beings with robotic replicants in a bid to undermine Japan and seize control of the country. Meanwhile, they process the original human beings through hypnosis to convert them into living machines of evil. SHADOW's Princess Mermaid, whose beauty not only seizes her human victims under sway, but also captures Hakaider in her Mermabot form, instigates this sinister plan. Can 01 stop the terrifying Mermabot from overthrowing Japan?