The goddesses' purpose is to bring happiness to everyone around them. Toward that end, Heaven has created the Goddess Technical Helpline (also called Goddess Relief Agency), designed to bring happiness to the people of Earth, especially those with great virtue but terrible misfortune. A competing institution named the "Earth Assistance Center", also is staffed by goddesses. In most scenarios, a goddess appears before one that the system has deemed worthy and grants him or her one wish. The wish must be approved by the system, after which a contract is created between the human and the goddess and stored on the Yggdrasil system as a file. The wish contract file is protected by a passcode known to the Goddess. As demons work toward the opposite end, the total happiness on Earth must remain in balance. Heaven and Hell strictly abide by an agreement to work through contracts and to prevent bloodshed between them, each god is linked to a demon by a life contract, thus if one of them is killed, the other perishes as well, with their memories of the contract erased to ensure no one knows who is paired with whom.