Eden is the mysterious organization that controls the Code: Breakers. They give the orders to the Code: Breakers of corrupt politicians that need to be assassinated or people that need to be protected from assassination.
EDEN was founded during the Meiji Era 100 years ago by the Emperor, Heike, Sakurakouji Sakurako, and one other currently unknown person.
Despite their need for Code: Breakers, they often refer to them as merely dogs and will get rid of them if they are no longer useful or see them as a future threat despite the fact they have done nothing wrong.
It has been stated there are three people who control EDEN currently, though the only one revealed so far is Fujiwara's dad.