Thousands of years ago, an ecological catastrophe destroyed almost all life forms on Earth. One of the surviving cities – perhaps the only one – is the domed city of Romdo. In an attempt to hasten mankind’s recovery from this tragic state, AutoRievs, robots that resemble a human, have been created to assist the people with their day-to-day activities. However, AutoRievs began to mysteriously gain self-awareness, which was later discovered to be caused by a disease called “Cogito Virus”.