Over the past century, Sentoids and humanity have been locked in a never-ending conflict. The Sentoids, accused of altering the course of humanity by exterminating those without power. Then on December sixteenth of 1974, an attack on Paris, Hong Kong, London, and Washington was simultaneously executed. The cities were destroyed entirely, and evidence pointed to the Sentoids. This was the tipping point that escalated the conflict, and the Sentoid Containment Organization was formed to protect humanity.