England, 1970, robots have reached such a dangerous level of intelligence that they have been made illegal for non-government use. Declaring themselves real life forms, a group of machines plague the city with ruthless attacks. With the army unable to retaliate efficiently, ACID – a new special anti-terror unit – are brought in. Their newest recruit, Moon Yukari, a British-Japanese police officer with a tragic past, is also forced to face her present and future.