Eden* is a visual novel game also known as Eden: They Were Only Two, On The Planet. It was developed by studio Minori, best known for their earlier titles Wind: A Breath of Heart (originally from 2002) and the "ef" series that began in 2006, both of which spawned anime adaptations. Eden* was released in Japan on September 18, 2009 as an all-ages game, however a patch adding adult content was also made available on the same day.