Masterpiece, best quality, ultra-detailed, beautiful cinematic anime illustration, dark Japanese supernatural fantasy, vertical composition.
A single beautiful young adult Japanese woman, Momiji, is standing alone beneath a huge pale full moon on a quiet moonlit night.
She has very long dark violet-black hair, soft pale skin, delicate feminine features, and a small purple floral hair ornament. She is wearing her normal light lavender private dress, an elegant modest one-piece dress with soft fabric, subtle floral details, a ribbon at the waist, and a gentle feminine silhouette.
She is caught in the middle of a terrifying Oni transformation.
Momiji bends forward slightly in intense pain, struggling desperately to remain human. Her breathing is strained, her expression filled with fear, sorrow and helplessness. Tears run down her cheeks.
One hand presses against the side of her face and temple as if trying to stop the transformation, while her other hand tightly grips her chest.
Her transformation is spreading gradually from one side of her body.
One eye is still her original soft violet human eye, wet with tears.
Her other eye has already transformed into a bright crimson Oni eye, glowing unnaturally in the darkness.
Around the transformed eye, subtle black-red supernatural markings begin spreading across her cheek and neck like elegant branching cracks.
A single small black-purple Oni horn is beginning to emerge from her forehead, while the second horn is only barely forming, clearly showing that the transformation is still incomplete.
The corruption continues down one shoulder, arm and side of her torso. Her pale lavender dress is gradually changing into torn, flowing black and deep-purple Oni garments, with faint crimson patterns appearing along the fabric.
The change should feel supernatural and painful, but still visually beautiful and elegant, not grotesque gore.
Behind Momiji appears a huge semi-transparent vision of her fully transformed Oni self.
The complete Oni Momiji is much larger than the human version, looming behind her like an unavoidable future.
Her fully transformed form has two long black-purple horns, completely crimson glowing eyes, long wild dark hair, elegant black and violet corrupted kimono-like clothing, dark markings across her body, and a cold yet deeply sorrowful expression.
The Oni apparition should resemble the same woman exactly, not a separate monster.
She looks down toward her human self with sadness rather than rage, as though she already knows what Momiji will become.
The relationship between the two figures must clearly communicate:
“She is painfully becoming the Oni that is already waiting inside her.”
Background: an isolated Japanese countryside at night, distant shrine torii gate, quiet lake reflecting moonlight, dark mountains, faint cherry trees, thin low mist.
The gigantic full moon should sit prominently behind both figures and create strong silver-purple backlighting.
Use restrained dark violet, black and crimson supernatural energy around the transforming side of Momiji.