In the near future, the brilliant Dr. Komyoji is enlisted to lead the ARK Project—a scientific endeavor dedicated to forging a brighter tomorrow through robotics. However, the doctor’s mysterious death puts those plans to an abrupt hold... Not long after, the grieving Komyoji children wander into the crosshairs of a black ops squad on the hunt for their father’s research. But from within the cross fire emerges Jiro—a bleeding-edge android programmed to protect the siblings! Now on the run, the Komyojis soon discover their father’s once hopeful ambitions have taken a DARK turn...

As each group pursues their mission, a fierce battle unfolds over the tattooed prisoners. Who is friend, and who is foe? The fight leads them all to Abashiri Prison, where Noppera-bo, the man who holds all the answers, is locked away...