Rumors stir throughout the land: when the wielder of the black sword draws his dark blade, all who stand in its path are torn asunder. Köinzell, the mysterious young boy who carries the black sword, undeniably...

It's an age where aliens, monsters and other dangers threaten the Earth, and various heroes have risen to protect it. Supporting these heroes are the human defense forces, of which the sisters Kitajishi Miyuki...