Kafka is a dark, hidden organization that does illegal genetic research. They oppose the government and work against Circus. They support something they call "Evolution", which uses a certain type of cell to change bodies and makes most people lose their minds and kill people to eat. It gives them great powers, which is why so many people find it enticing, although they aren't trusted by Kafka. Kafka is suspected by the government and Circus, but no one has been able to find evidence of their activies. They always come close, but can never find proof.