Seedance 2.5, image-to-video, 30 seconds, 16:9.
Use the reference image as the strict visual and character reference.
Preserve the girl's exact identity and design throughout the entire video: long dark brown hair, heavy bangs, dark navy oversized school coat, white blouse with black ribbon tie, short dark pleated skirt, black socks and gray shoes. Keep her facial structure, proportions, clothing and hairstyle consistent in every shot. Maintain the rough high-contrast 2D anime illustration style of the reference: off-white background, dark navy and charcoal palette, strong graphic shadows, intentionally rough linework, limited-color cel shading, hand-drawn sakuga feeling.
CONCEPT: A girl practicing shadow boxing discovers that her own shadow has begun moving independently. At first the difference is subtle, then the shadow becomes increasingly aggressive and finally rises from the floor as a three-dimensional black silhouette. The girl fights it through rapid technical hand-to-hand exchanges. No repeated shots or repeated actions. Every beat must visually escalate.
0:00-0:05 — IMMEDIATE HOOK / THE SHADOW MOVES FIRST Open without an establishing shot. Extreme close-up of the girl's eyes beneath her bangs. Her eyes suddenly sharpen. SMASH CUT to an extreme low-angle wide shot. She stands alone against an enormous empty off-white space, fists raised in a compact boxing guard. Her long coat and hair drift slightly. Camera performs a rapid dolly-in. Before the girl moves, her dark shadow on the floor suddenly throws a violent straight punch by itself. The girl remains completely still. Hold for a fraction of a second. Her eyes snap downward. 急激な寄り, PAN UP into her surprised face. The shadow immediately throws a second punch toward the camera while its owner still has not moved. Use 強いパース, exaggerated foreshortening and a brief スメア frame as the shadow fist fills the screen. CUT ON IMPACT.
0:05-0:09 — SOMETHING IS WRONG Side-profile medium shot. The girl cautiously throws one slow left jab. Her real arm extends left — but her shadow simultaneously throws a completely different right hook. She freezes. Insert shot: her shoe pivots slightly against the white floor. Insert shot: fingers tightening inside her fist. Insert shot: the shadow's fingers flex independently. Camera slowly arcs around her while she watches the floor. The shadow shifts into a fighting stance before she does. She lowers her center of gravity. Expression changes from confusion to concentration. タメ. Silence-like visual pause. Then both explode into motion.
0:09-0:14 — ASYMMETRICAL SHADOW BOXING Fast lateral tracking shot. The girl fires jab → cross. The shadow answers with hook → sweeping kick. She sees the incoming shadow attack and performs a sharp スウェー, leaning backward just as the black leg appears to slice visually across her body. WHIP PAN. She rotates back forward and drives a compact body punch toward the floor. The shadow slips sideways unnaturally. Camera switches to overhead view: girl and shadow circle each other while remaining physically connected at her feet. She performs quick footwork: side step → pivot → shoulder feint → short uppercut. The shadow responds differently to every movement. Use タメツメ, メリハリの強いポージング, 中割り省略 on the fastest attacks, brief 止め followed by explosive acceleration. Hair and coat tails react clearly to every turn.
0:14-0:18 — THE SHADOW ESCAPES The girl attempts a powerful downward punch. At the instant her fist approaches the floor— the shadow stretches impossibly far away from her. Camera rapidly cranes backward as the black silhouette races across the white ground like liquid ink. The girl's eyes follow it. The shadow suddenly stops. Low-angle shot from behind the girl. The flat silhouette begins peeling itself vertically from the floor. First the head. Then shoulders. Then arms. A completely black humanoid figure rises upright directly opposite her. No facial features. No costume details. Only a sharp black silhouette matching her body proportions. Its final foot disconnects from her original shadow. A circular camera orbit reveals the girl and her living shadow facing each other. Her hair sweeps across frame, creating a natural wipe transition.
0:18-0:24 — GIRL VS SHADOW / SAKUGA BURST The shadow attacks first. Sudden high-speed rush toward camera. 強烈なパース: its fist becomes enormous in the foreground. The girl slips outside the punch by centimeters. Extreme close insert: black fist passing beside her cheek, moving strands of hair. She counters with a short hook. The shadow ducks. Camera drops with it into an ultra-low angle. Shadow sweeps its leg. The girl jumps over the sweep, coat opening in the air. Camera rotates underneath her during the jump. She lands directly into a forward dash. Rapid exchange: straight punch → parry → elbow feint → shoulder slip → hook → duck → pivot → counter straight. Do not show random flailing. Every attack must receive a readable defensive reaction. Use アクションつなぎ, follow-through animation, clear anticipation and recoil. Alternate between: extreme close-up impact inserts, dynamic Dutch angles, overhead geometry, ground-level tracking, rapid push-ins, short orbiting camera movements. Use rough impact lines, black ink-like speed streaks, スメア, deformation frames and strong silhouette posing. No glowing magic, no explosions. The visual spectacle comes entirely from animation, composition and movement.
0:24-0:27 — FINAL COUNTER Both fighters separate. Wide symmetrical composition. Girl on left. Shadow on right. They simultaneously raise identical boxing guards. Complete stillness. タメ. Extreme close-up of the girl's eye. Extreme close-up of the shadow's featureless face. Both launch forward simultaneously. Camera races sideways with them. They throw identical straight punches. Just before collision, the girl changes rhythm: tiny shoulder feint → slip outside → pivot. The shadow punches through empty space. Camera performs a violent 180-degree whip rotation around her. She plants her rear foot. 腰から力を伝える. Her coat and hair lag behind for one frame. Then— one extremely powerful straight counter. Use a single exaggerated スメア drawing connecting her shoulder, arm and fist.
0:27-0:30 — SYNCHRONIZATION At the exact moment the punch connects with the shadow's chest: 完全な止め. The black figure ripples like spilled ink. Instead of being destroyed, it collapses vertically onto the floor. Overhead shot: the liquid-black silhouette races back toward the girl's feet. It reconnects naturally as her ordinary shadow. She looks down. She cautiously raises her right fist. This time the shadow raises the same fist at exactly the same moment. Perfect synchronization. Camera slowly rises from the shadow toward her face. She gives an extremely subtle confident half-smile. Final rapid pull-back reveals her alone in the enormous white space, standing in the same strong boxing guard silhouette suggested by the reference image. CUT TO WHITE.
ANIMATION DIRECTION: Prioritize Japanese 2D action-animation language: 原画感の強いポージング, タメツメ, 中割り省略, メリハリ, 強いパース, アオリ, 俯瞰, PAN, 急激な寄り, スメア, deformation frames, 止め, follow-through, アクションつなぎ. Preserve readable silhouettes even during extremely fast movement. Movement should alternate between short moments of extreme stillness and sudden explosive bursts. Each new shot must introduce a different composition, action or camera relationship.
CAMERA: Highly dynamic but intentional anime cinematography. Extreme close-ups, ground-level low angles, overhead shots, aggressive perspective, lateral tracking, whip pans, short orbital moves and sudden push-ins. Camera movement must support the choreography rather than shake randomly. Avoid repetitive frontal medium shots.
NEGATIVE: No character redesign, no hairstyle change, no clothing change, no additional human characters, no duplicate girl, no extra limbs, no malformed hands, no inconsistent face, no photorealism, no 3D CGI appearance, no colorful environment, no detailed background scenery, no weapons, no text, no subtitles, no logos, no slideshow presentation, no static montage, no repeated animation cycles, no repeated punches, no meaningless camera shake, no glowing supernatural aura. The independent shadow must remain visually distinct: pure black, featureless and silhouette-like.
