Irreligion (非信者の氏族 (イルレリッギオﾝ); Irureriggion) also known as the Non-believer Clan is an organization dedicated to the track and hunt of supernatural beings regardless of its nature or alignment. Irreligion rivalizes with the Chuch since their ideas are opposite (Irreligion is not affiliated with any kind of religion, just as its name states). The main cast is affiliated with the organization.