Noragami

A dark-haired anime character with glowing purple eyes stands in a dark void, then engages in a high-speed battle against a long-haired opponent under a red sky, their movements creating bright light trails, before the scene cuts to a close-up of the dark-haired character's face, bloodied and determined, and finally to a somber shot of the two characters standing back-to-back in a desolate, foggy landscape.