Create a high-resolution Japanese dark fantasy anime key visual. The main subject is a lone samurai demon hunter, shown from behind in the foreground. The samurai should be the clear focus of the image. Use an over-the-shoulder composition: his back, shoulder, hand, katana, and part of his side profile are visible. His face is not fully shown, but one sharp eye or a small part of his serious expression can be seen from the side, giving him a calm and intimidating presence. The samurai stands on a broken stone path in an abandoned shrine at night. He wears a dark, refined samurai outfit with elements of traditional kimono armor: black, deep navy, dark crimson, and subtle white accents. His clothing should look elegant, practical, and battle-worn, not futuristic. One hand grips the katana handle while the blade is slightly drawn from the scabbard. A faint blue-white spiritual light leaks from the partially drawn blade and illuminates the mist, fallen sakura petals, and his hand. In the distance, beyond the samurai, a gigantic oni stands in the fog. The oni should feel enormous and terrifying, but not fully revealed. Show its huge horns, massive shadowy body, and glowing red eyes through the mist and darkness. The oni is the threat, but the samurai remains the main subject. The setting is a ruined Japanese shrine under a full moon. Include a damaged vermilion torii gate, cracked stone lanterns, drifting mist, pale night sakura petals, and a quiet shrine courtyard. The atmosphere should feel like the final quiet moment before battle begins. Use cinematic lighting and a dramatic but calm composition. The color palette should be deep indigo night, dark shadows, muted vermilion, blue-white spiritual light, and the oni’s red glowing eyes. The image should feel high-detail, sharp, atmospheric, and emotionally tense. Style: high-quality anime illustration, Japanese dark fantasy, cinematic key visual, detailed character design, highly detailed katana, realistic lighting within an anime style, refined linework, smooth shading, rich atmosphere, dramatic moonlight, misty depth, serious tone, no text.

Negative Prompt: Do not make the samurai small or insignificant. Do not turn the scene into an active battle. Do not show multiple main characters. Do not make the oni fully clear or cartoonish. Avoid cute style, chibi style, modern clothing, futuristic armor, cyberpunk elements, guns, excessive magic effects, gore, heavy blood splatter, text, logo, watermark, overly bright colors, crowded composition.