Silhouette Mirage (シルエットミラージュ) is a anime series based on the game by Treasure.
The setting is Earth, during a post-apocalyptic year 2000. Prior to the events in the game, a group of scientists conducted genetic experiments in a great facility called Edo. From their activities emerged the two attributes: Silhouette and Mirage. These aspects manifested in a child named Armageddon (Clod).
The two aspects were based on the dualistic nature of Yin and Yang: One's existence is crucial to the other's. Despite the complementary nature of the attributes, they repelled each other. As a result, Armageddon's attributes split to form two pure figures: Megido and Har, respectively the self-proclaimed Silhouette and Mirage leaders.
Eventually, the genetic experiments resulted in a biological explosion which contaminated the genetic structure of all entities on Earth. Many perished, and those that survived displayed either of the two attributes (a special group, called Proteans, can display both attributes).
In preparation for this disaster, the computer system Gehena created a being known as 'The Messenger of Justice' (hostile figures dubbed her 'Messenger of Destruction'), designed to repair Edo's computer's system and neutralize all the instances of the two attributes.