"Imagine Rias Gremory in a semi-realistic anime style, emerging from a dark red portal, with a cinematic atmosphere. The scene is shot from a low angle, emphasizing her powerful and commanding presence. Rias, with her long, vibrant red hair, is enveloped by an otherworldly aura, while the portal behind her pulses with intense red energy and deep shadows. Her expression is determined, and the details of her costume, illuminated by dramatic lighting, highlight her glowing eyes and the texture of her hair. The background is shrouded in dark shadows, accentuating the mystical power and mystery of the scene."