The plot of the mecha anime centers on 13-year-old Meguru Tokio, who encounters an enigmatic woman in her early twenties named Meguru. Despite their age difference, they share the same name and possess contrasting personalities - the older Meguru is passionate while the younger one struggles to cope with it. As a result of this encounter, Meguru Tokio becomes entangled in the older Megurus conflict against an unknown organization. The group's leader, Rei, poses a threat not only to the older Meguru but also to the young Meguru.
The story takes a twist when the younger Meguru discovers that the older Meguru is her descendant from the future. This revelation leads them to uncover that someone has traveled back in time through the older Megurus history surveillance device. In response, they decide to journey back into the past as well.