In the future, twins Mika and Ellie live behind The Wall, a concrete barrier made to protect humans from animals that have gone crazy with plague. Then Ellie goes missing, and Mika is the only one who believes she's still alive. Mika can feel Ellie's presence through a futuristic arcade game released by the government, and the farther he gets in the game, the more he realizes their entire world is built on a foundation of lies.