Many years have passed since Naota and Haruko shared their adventure together. Meanwhile, the war between the two entities known as Medical Mechanica and Fraternity continues to rage across the galaxy. Enter Hidomi, a young teenage girl who believes there is nothing amazing to expect from her average life, until one day when she is ran over by a strange woman named Julia Jinyu. Shortly after, a new teacher named Haruko arrives at her school. As if things aren’t strange enough, Medical Mechanica is attacking her town and Hidomi discovers a secret within her that could save everyone, a secret that only Haruko wants to unlock for her own secret agenda.
Why did Haruko return to Earth? What happened to her Rickenbacker 4001she left with Naota? And where did the human-type robot ‘Canti’ go?