Part III is different from the first two parts for several notable reasons. Firstly, it takes place on Earth, several centuries after the Megazone landed with Shogo, Yui and the rest of the survivors. Because of this none of the original characters return apart from Eve. The story takes place primarily in the city of Eden, a super futuristic, enormous city, the first and last city to be built on Earth (depending on how you look at it). The city was built by 'The System' for humans to live in until a time it decides humans and nature are in balance and the human race can be released into the renewed Earth. All citizens of Eden wait for the 'Day of Liberation'. The Day of Liberation is kept fresh in people's minds by Bishop Won Dai, supposedly one of the original survivors of the Megazone as he is a direct link to The System itself.