This game is based on the Chaos Lineage Drama CD series.

After countless failed attempts, Karlheinz finally thinks that his “Eden Project” has been sucessful and begins to make plans to bequeath his powers to his sucessor & fade from existence. However, his longtime friend & chess partner Socrates isn’t quite convinced that Karlheinz’s chosen Adam & Eve are up to the task. To test the pair’s love is true, he decides to trap all of the guys & Yui in a world that he has created, as well as wiping all of their memories.

Inside the fake world, the guys are seperated into three families – Orange, Scarlet & Violet. The families have been locked in a battle to the death in order to decide who will become the “Supreme Ruler”. The key to this is the legendary “Sleeping Princess” called Eve whom will, the legend foretells, appear in the church one day. With all the players set, this deadly game of survival begins, will Yui & the guys ever get their memories back so they can return to their own world?

[from Zettai Renai]