In the year 2188, this is the age of Cyberpunk, a world where AI develops and biological weapons and people are "half human, half machine". Suddenly one day, there was an invasion from an unknown entity, the "Darkness of Ashes". It destroys where it goes, destroying all life. The world's population has decreased by 95%. But at the same time, it also helps humanity gain "special powers". That power is only found in young girls who have just turned 18. They will awaken the power of "Darkness" to defeat "Darkness of Ashes". And they are called "DarkValkyrie"