Create a striking anime-style illustration of a lethal ninja nun

Create a striking anime-style illustration of a lethal ninja nun. The character should be a young woman with long, jet-black hair and straight bangs, framing a face with piercing red eyes and slightly parted lips. Her expression should convey a mix of detachment and danger. Dress her in a form-fitting black habit, reimagined as a sleek combat outfit. The habit should have a high collar and flowing sleeves, contrasting with multiple leather straps and buckles cinching the waist and thighs. Include a white coif framing her face, adding a stark contrast to her dark attire. Position a katana diagonally across her back, its hilt visible over her right shoulder. The sword's wrapping and tsuba should be intricately detailed. Set the character against a vivid red background, creating a bold contrast that heightens the sense of danger and drama. Use dramatic side-lighting to accentuate the curves and edges of her outfit, casting sharp shadows and highlighting the glossy texture of her hair and the metallic elements of her gear. The art style should blend clean, sharp lines with subtle gradients, emphasizing the character's deadly grace. Pay close attention to small details like the reflection in her eyes, the texture of the leather straps, and the folds in her habit. Incorporate hints of hidden weapons beneath her outfit, suggesting her lethal capabilities. The overall composition should exude a sense of controlled power, religious devotion twisted into something dangerous.