Black bullet

A man with blood on his face screams in terror as he looks up at a massive, dark mechanical creature with glowing red eyes and a long, horse-like head, set against a night sky filled with floating lights; the scene cuts to a close-up of the man's terrified face, then to a bright flash, followed by a wide shot of a city under attack with a large blue creature in the distance, and finally to a dark, stormy sky.