Noragami

A young man with dark hair stands holding a large, curved sword, its blade glowing with a white and blue light against a hazy, bokeh-filled background. The scene cuts to a close-up of a green, amorphous creature with a single large eye, then shows the creature floating in the night sky near power lines, followed by a close-up of a man with glowing blue eyes, and finally a view of the green creature with purple cracks on its surface.