Darker than black

A character with purple hair and bloodied face stares intensely, followed by a man in a uniform falling down a set of stairs with blood, then a man in a suit striking another character, who is then shown with a wide grin, and finally a woman in a suit wielding a glowing blue sword against a dark figure. The scenes take place in various settings including a dimly lit alley, an outdoor urban area, and a dark indoor space.