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# The Scarlet Line - [ #1 0.05s ] ACTION:STILL ref frame; girl+cat centered; paper-dust “snow”; CAMERA:locked MS; — [STATIC] /* Ki */ | SUBJECT:{humanoid child girl; black bob; red scarf; blue coat; orange boots; motion:single blink} + {animal black cat; amber eyes; blue tag; motion:tail tip twitch} | SCENE:{infinite white paper-canvas; abstract warm-left/cool-right tower strokes; snow-speck grain} | LIGHT:{high-key diffuse; soft rim; no hard shadows} | GRADE:{colored-pencil tooth; wax bloom; line-boil jitter; 16fps stepped feel} | CAM:{MS; centered symmetry; flat-white negative space} | AUDIO:{BGM:one distant piano note; SFX:paper hiss} - [ #2 1.20s ] ACTION:scarf snaps; a scarlet stroke slashes forward and “draws” a road; CAMERA:smash-zoom ECU→WS; — [DYNAMIC] /* Ki */ | SUBJECT:{red scarf becomes living brushstroke; motion:whip/settle} + {cat silhouette; motion:flinch} | SCENE:{white canvas emptiness; red line pulls a vanishing point; graphite flecks erupt} | LIGHT:{bright bounce; specular on pencil dust; white exposure roll-off} | GRADE:{scarlet pop; scratch texture; frame-by-frame high drawing count; line jitter} | CAM:{ECU fibers→wide pullback; 24mm feel; whip-pan match-cut on the red line} | AUDIO:{BGM:sub swell @150BPM double-time; SFX:pencil rip + whoosh; CUE:#2 impact hit} - [ #3 1.45s ] ACTION:hold on cat’s eye; a ruined skyline “draws” inside the reflection; CAMERA:slow push; — [STATIC] /* Ki */ | SUBJECT:{black cat; amber iris reflection; whiskers tremble; motion:minimal} | SCENE:{white canvas; faint ruin-strokes breathing with jitter; ash-

keigo matsumaru

@keigo_matsumaru

SORA · 2025-12-19Source

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Prompt

GLOBAL LOCK: hand-drawn colored-pencil animation, high-key white paper-canvas world, visible grain and waxy pencil texture, stepped low-frame movement, black-haired girl in blue coat with red scarf and orange boots, black cat with amber eye, scarlet brushstroke line that becomes a path, abstract city ruin sketches, minimal dialogue-free teaser structure, no watermark, no subtitles.

[00:00-00:05] Begin in near-static symmetry on the girl and her cat against a white paper world. The red scarf and the cat’s amber eye act as the first strong points of color in an otherwise sparse canvas.

[00:00-00:05] The scarf whips outward and transforms into a living scarlet brushstroke, slashing across the blank space and drawing a path into the distance.

[00:00-00:10] The cat’s eye fills the frame, hinting at a ruined skyline reflected within it. The world remains mostly white and sketchlike, with graphite structures and floating dust giving the impression of a city still being drawn into existence.

[00:00-00:15] The girl and cat face doorways, streets, traffic lights, and urban fragments assembled out of charcoal lines and red accents. The scarlet line continues threading them forward like fate, memory, or a map.

[00:00-00:20] The red line expands across the page in bold painterly sweeps, dominating the composition while the small figures keep walking through the abstract environment toward a glowing rectangular doorway.

[00:00-00:25] End on the girl stopping before the lit doorway as the red line resolves into the teaser title card: "The Scarlet Line." The feeling should be mysterious, lyrical, and slightly ominous.

NEGATIVE PROMPT: glossy 3D rendering, smooth modern vector animation, bright saturated cartoon backgrounds, realistic live action, cluttered city detail, dialogue balloons, subtitles, watermarks, extra characters, soft unfocused linework, inconsistent costume colors.

SPEECH PACK: No dialogue required. Let the atmosphere, line movement, and title reveal carry the teaser.

How keigo_matsumaru Made This The Scarlet Line Colored Pencil Teaser AI Video - and How to Recreate It

The Scarlet Line is a stylized teaser rendered like a rough colored-pencil film on white paper. A girl in a blue coat and red scarf moves through an unfinished sketch world with her black cat, while the scarf transforms into a living scarlet stroke that literally draws the road ahead.

Scene Breakdown

The first images are almost still, presenting the girl and cat as quiet figures centered in blank space. The turning point comes when the scarf lashes outward and becomes a red line that organizes the whole world. After that, the teaser moves through fragmented city symbols: doors, streets, signs, and ruins half-emerging from charcoal marks. The red path keeps leading the pair forward until it culminates in a glowing doorway and a title card reveal, making the short feel like the opening of a larger myth.

Why It Works

The concept works because it turns a single visual element, the scarf, into both character identity and narrative engine. That scarlet stroke is not just decoration; it becomes direction, danger, and destiny. The sparse white-paper environment gives every red mark extra meaning, while the cat adds just enough emotional companionship to keep the teaser from feeling abstract.

Visual Style

The strongest quality is the deliberate roughness: visible pencil tooth, jittering outlines, stepped motion, and hand-drawn urban fragments that look like they are still being imagined. Red, black, and blue dominate the frame against white negative space, producing a graphic, instantly recognizable palette. The whole piece feels halfway between a children’s picture book, an indie animation short, and a moody graphic-novel trailer.

How keigo_matsumaru Made This The Scarlet Line Colored Pencil Teaser AI Video - and How to Recreate It

Scene Breakdown

Why It Works

Visual Style

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