The Apple of my Eye

Based on the manga and anime of Diabolik Lovers
Two young girls are born in a day marked in history as the day Adam first landed on earth along with his beloved Eve. Eve was tempted to eat from the forbidden tree and was granted eternal life by the snake of Saint.
Eve loved Adam so much and did not wish to part from him so she gave her blood to him and together they lived forever.
now Anna and Elizabeth must find their destinies and will be prey to the Sakamaki brothers who will stop at nothing to reach ultimate power and control the world.
what is their role in this sad story of love?