When Kuroi Mato, ounce again gose back to the Black★Rock Shooter world. But then something changes when Black★Rock Shooter is in a different world that's the same. But then Black★Rock Shooter finds someone just like her. And together fight the darkness. As the adventure goes Black★Rock Shooter notices it has happened to her enemies as well. The same people, that are like them. But will this darkness will last stronger or weaker? "No matter what. I will. Keep fighting!"