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Ryotaro is a boy who loves robots and lives out in the country with his three sisters but he's headed to Tokyo for high school. Before leaving, he runs across a humanoid military robot and has a fateful encounter with its pilot, a cute teenage girl who calls herself La Vie en Rose. Ryotaro will almost certainly meet her again in Tokyo, considering his family connection to the production of these humanoid robots--his father worked with them.
They were instructed to kill each other in the city of Tokyo until 10,000,000 people were eliminated from the city. This genocidal game known as "Save the Earth" happens every 4 years. An over-populated city is randomly chosen to become the forced killing grounds of its denizens, and each person has to kill the other. They have no choice, and no escape. Akira Suwa must now fight to protect his loved ones and himself in this genocidal game.
Betrayed by his own men, Captain Grahad Mills, a commander of the SAA Special Force "Jackal," is held responsible for a conspiracy about which he knew nothing. Without defense counsel at his court, he is sentenced to death. On the morning of his execution, he escapes the military detention center; in the process blasting a troop of national military guards and killing its commander - Captain Waldman, his former subordinate and betrayer. All this is for revenge and to find out the reason for the treachery. The former hero - feared and known as "Genocide" - starts to fight a battle he created by himself.