SoulWorker

A female anime character with long hair sits on a rooftop under a full moon, then the scene cuts to a close-up of her face in profile, followed by a shot of her playing a guitar surrounded by glowing purple creatures, then a close-up of her face with a determined expression, then a swirling purple and blue energy effect, and finally a silhouette of her standing with arms outstretched as a massive purple energy formation erupts behind her. The setting is a dark, urban environment at night.