Dawn of the Eclipse: Episode Zero Hate no Issen: Episode Zero

In the distant future, a war is raging between humans and the "Black Knight", an extraterrestrial invasion weapon. After a fierce battle, the human race has the upper hand in the war and executes a last-ditch mission to wipe out the Black Knight. In order to open up the future, the protagonist "Haru" goes to the battlefield... (Source: Official YouTube channel)