Meguru Tokio's ordinary existence at thirteen shatters upon meeting an older teenager sharing her name, Meguru, who declares herself a visitor from the future. This intense and passionate future counterpart clashes with Tokio's initial reluctance and struggle to accept this sudden intrusion. Both swiftly become targets hunted by a mysterious organization commanded by Rei, thrusting them into conflict centered around a dimensional robot.

Through their shared ordeal, Tokio uncovers a profound truth: the older Meguru is her direct descendant. This revelation forges an unexpected familial bond across their temporal divide and differing personalities. Equipped with a history surveillance device revealing unauthorized temporal incursions by hostile forces, the older Meguru prompts their collaboration. Together, they embark on a critical mission back into the past to confront these threats directly.

Their alliance focuses on repelling the organization's assaults and protecting the integrity of the timeline. The narrative culminates with both Megurus undertaking a decisive leap back through time, continuing their mission to counter the antagonists' disruptions.