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...

High school student Shun Takahata is bored. Bored with the day-to-day monotony of school and life, he prays for change, for something exciting. Suddenly, he and his classmates are forced to play deadly children's games and facing terrifying creatures from a talking Daruma doll to a sharp-clawed lucky cat.