Emil Chronicle Online (Japanese: エミル・クロニクル・オンライン), often referred to as ECO, is a massively multiplayer online role-playing game created by Headlock and published by GungHo. It was first released in Japan on November 24, 2005 for Microsoft Windows. Gravity purchased the worldwide distribution rights for all regions except Japan from GungHo Online Entertainment Inc. in November 2005. On December 18, 2006, Infocomm Asia Holdings licensed the game for release in Southeast Asia and Oceania. Currently, there is no set release date for this version.