[Speech rule — read first] The woman speaks JAPANESE ONLY. She never speaks Chinese, English, or any other language. She speaks almost continuously for the whole clip. She says exactly this one sentence, broken into four phrases, in this order and nothing else: 「Seedance 2.5なら」 「黒板に日本語の文字を」 「書くことができます。」 「とても便利ですね」 She delivers it at the unhurried pace of a teacher writing on a board: her voice slows to the speed of her own chalk, so each phrase is spoken while her hand is forming that same phrase. Voice and chalk advance together. Only a short natural breath separates one phrase from the next — no long pause anywhere. Total speech fills roughly 13 of the 15 seconds. The only silence is the final 0.8 seconds, where she has finished writing and simply smiles and nods. Forbidden at all times: ad-libbed dialogue, filler words, repeating a phrase, reading the sentence twice, humming, laughing, sighing, and every wordless vocalisation such as "んっ" "うん" "ふふ" "ah" "mm" "hm". She says the four phrases once each and nothing more. Pronounce "Seedance 2.5" as English "seedance two point five". [Reference] @Image1 = the keyframe: a woman in a white coat standing beside a completely empty green chalkboard, holding a slim wooden pointer at her side. Strictly preserve @Image1's face, hair, glasses, white coat, the chalkboard's position and size, the easel, the background shelves, and the framing. Nothing moves in the frame except her arm, her upper body, her face, and the chalk marks she draws. [One-line summary] 15 seconds. A cheerful presenter gives a short lecture, writing four lines of Japanese on a green chalkboard with the tip of a wooden pointer while speaking the same words aloud. Pixar-style 3D animation. Locked-off static camera. [Global setup] Environment: warm indoor study room, soft warm ceiling light, shallow depth of field, background shelves stay blurred. Highly realistic physical texture on the chalk dust and the wood of the easel. Visual style: Pixar-style 3D animation, warm color grade, soft shadows. Camera language: medium shot, eye level, straight-on. The camera is completely locked off — no pan, no tilt, no zoom, no push-in, no handheld shake. One camera behavior only: none. Character: as in @Image1. Keep the glasses, the hair silhouette, and the coat identical. Keep believable skin shading and fine surface detail — do not make her look plastic. Acting core: a warm, confident teacher who enjoys showing something off. *** WRITING RULE — SHE IS THE ONE WRITING, AND SHE WRITES AS SHE SPEAKS. *** Every chalk mark is produced by her own hand movement, in time with her voice. For each phrase: 1. Her shoulder and elbow carry the pointer tip to the start of the line. Her torso turns slightly toward the board and her eyes go to that point first. 2. The tip presses lightly to the board and travels along the path of each stroke. The chalk line appears directly behind the moving tip, following it exactly, never running ahead of it, never appearing anywhere the tip has not touched. 3. Characters are formed one stroke at a time, in correct Japanese stroke order, left to right. Faint chalk dust puffs at the tip and a soft scraping sound follows it. 4. Between strokes the tip lifts a few centimetres, then sets down at the start of the next. 5. The syllables she speaks land together with the characters she is forming — when her voice reaches a word, her hand is writing that word. Voice and chalk stay in step. 6. At the end of each line she lowers the pointer slightly, takes one small breath, glances at the camera, then moves to the line below. Her arm leads and the mark follows — the timing of the arm and the timing of the mark must match frame for frame. Marks NEVER fade in as a whole word. Marks NEVER appear while her arm is at rest or while the tip is away from the board. No invisible hand. No magic writing. The arm motion is fluid and human: the wrist flexes, the elbow opens and closes, the shoulder carries the reach across the board, her body weight shifts slightly as she reaches. Once a line is finished it stays on the board unchanged for the rest of the shot. Japanese script rule (important): Render every kanji with its correct stroke structure and correct number of strokes — 黒 板 日 本 語 文 字 書 便 利. They must be legible as real Japanese characters, not invented or Chinese-simplified lookalikes. Write them at a generous size so the strokes stay separated. "Seedance 2.5" is written in Latin letters and digits exactly as spelled: S-e-e-d-a-n-c-e, space, 2, period, 5. Chalk colors — only two, never any other: YELLOW chalk for "Seedance 2.5" only. WHITE chalk for everything else. Layout rule (important): Four lines, left-aligned to a common left margin, stacked evenly down the board from top to bottom, filling the board by the end. Large, cheerful hand-lettered chalk style with slightly uneven strokes. Exact content, top to bottom: Seedance 2.5なら 黒板に日本語の文字を 書くことができます。 とても便利ですね Never centre a line. Never write small. Each line is written as large as it can be while still fitting: a completed line spans almost the full writable width of the board, from the left margin nearly to the right edge of the board, and the four lines together fill the board from top to bottom. Characters are wide and generously spaced so that dense kanji such as 黒 板 語 書 便 利 keep their strokes separated and legible. If a line would not fit, make the characters narrower rather than shorter in height — never shrink a line so that it occupies only part of the board's width. Do not add any other word, symbol, arrow, underline or drawing. Forbidden: no subtitles, no captions, no on-screen UI, no watermark, no background music, no camera movement, no cutting to another shot, no extra people, no second hand entering the frame, no stick of chalk held in her free hand, no distortion of lines already written. [Timestamp storyboard] 0.0-3.6s LINE 1 Action: she raises the pointer to the upper-left of the empty board and writes "Seedance 2.5なら" in YELLOW chalk — first the Latin letters and digits, then the kana なら — the marks trailing the moving tip. Speech (in step with the writing): 「Seedance 2.5なら」 Intent: a small proud lift in her eyebrows on the brand name. This is the thing she is showing off. Camera: locked. No subtitles. No BGM. Japanese only. 3.6-7.2s LINE 2 Action: she drops to the next line and writes "黒板に日本語の文字を" in WHITE chalk, stroke by stroke. Her eyes follow her own tip. Speech (in step with the writing): 「黒板に日本語の文字を」 Intent: matter-of-fact, the setup half of the sentence. Keep the arm steady and even. Camera: locked. No subtitles. No BGM. Japanese only. 7.2-11.0s LINE 3 Action: she drops to the third line and writes "書くことができます。" in WHITE chalk, stroke by stroke, ending with a firm dot for the 。 Speech (in step with the writing): 「書くことができます。」 Intent: this is the payoff of the sentence — her voice firms up slightly on ます, and the final dot is pressed with a small decisive tap. Camera: locked. No subtitles. No BGM. Japanese only. 11.0-15.0s LINE 4 — the close Action: she writes "とても便利ですね" in WHITE chalk on the bottom line, then lowers the pointer to her side, turns her face fully to the camera, breaks into an open warm smile and gives one clear nod. She holds that pose for the final 0.8 seconds in silence. Speech (in step with the writing, finishing by 14.2s): 「とても便利ですね」 Intent: the nod is the close. Warm, a little playful, as if sharing a good discovery. Camera: locked. No subtitles. No BGM. Japanese only. [Closing constraints — restated for the whole clip]
[语音规则 — 请先阅读] 该女性仅说日语。她绝不说中文、英文或任何其他语言。在整个视频片段中，她几乎不停地说话。她准确地说出这一句话，分为四个短语，按此顺序排列，不包含其他内容： 「Seedance 2.5なら」 「黒板に日本語の文字を」 「書くことができます。」 「とても便利ですね」 她以教师在项目上书写时从容的节奏进行表达：她的语速与粉笔书写的速度同步，因此每个短语的读音都与她手部书写该短语的过程一致。声音与粉笔同步推进。每个短语之间仅有短暂的自然停顿，绝无长停顿。总语音时长约占 15 秒中的 13 秒。唯一的静音是在最后 0.8 秒，此时她已书写完毕，微笑着点头。严禁事项：即兴对话、填充词、重复短语、重复朗读句子、哼唱、大笑、叹气，以及任何无意义的发声，如 "んっ" "うん" "ふふ" "ah" "mm" "hm"。她仅将这四个短语各说一遍，不再添加任何内容。将 "Seedance 2.5" 发音为英文 "seedance two point five"。 [参考] @Image1 = 关键帧：一位身穿白大褂的女性站在完全空白的绿板旁，身侧拿着一根细木教鞭。严格保留 @Image1 的面部、头发、眼镜、白大褂、黑板的位置和尺寸、画架、背景书架以及构图。画面中除了她的手臂、上半身、面部以及她画出的粉笔痕迹外，没有任何移动。 [单行摘要] 15 秒。一位开朗的演示者进行简短讲解，用木教鞭的尖端在绿板上书写四行日语，同时大声说出相同的词句。Pixar 风格 3D 动画。固定静态摄像机。 [全局设置] 环境：温暖的室内书房，柔和的暖色顶灯，浅景深，背景书架保持模糊。粉笔灰和画架木材具有高度逼真的物理质感。视觉风格：Pixar 风格 3D 动画，暖色调，柔和阴影。摄像机语言：中景，平视，正对。摄像机完全锁定 — 无平移、无倾斜、无缩放、无推进、无手持抖动。仅有一种摄像机行为：无。角色：同 @Image1。保持眼镜、发型轮廓和外套一致。保持真实的皮肤阴影和精细的表面细节 — 不要让她看起来像塑料。表演核心：一位温暖、自信、乐于展示成果的教师。 *** 书写规则 — 她是书写者，且边说边写。 *** 每一道粉笔痕迹都由她自己的手部动作产生，并与声音同步。对于每个短语： 1. 她的肩膀和肘部带动教鞭尖端移动到行首。她的躯干略微转向黑板，视线首先看向该点。 2. 尖端轻压在黑板上，沿着笔画路径移动。粉笔线条直接出现在移动的尖端后方，紧随其后，绝不超前，绝不会出现在尖端未触及的地方。 3. 字符按正确的日语笔顺一笔一画地形成，从左到右。尖端处有淡淡的粉笔灰，并伴随轻微的刮擦声。 4. 在笔画之间，尖端抬起几厘米，然后落到下一笔的起点。 5. 她说出的音节与她正在形成的字符同步 — 当她的声音读到某个词时，她的手正在书写该词。声音与粉笔保持步调一致。 6. 在每一行结束时，她稍微降低教鞭，进行一次小呼吸，瞥一眼摄像机，然后移动到下一行。手臂引导，痕迹跟随 — 手臂的节奏与痕迹的节奏必须帧帧匹配。痕迹绝不会作为一个完整的词淡入。痕迹绝不会在她手臂静止或尖端离开黑板时出现。没有隐形的手。没有魔法书写。手臂动作流畅且符合人体工学：手腕弯曲，肘部开合，肩膀带动横跨黑板的动作，身体重心随着伸手动作略微偏移。一旦一行书写完成，它将保持在黑板上直至镜头结束。日语书写规则（重要）：渲染每一个汉字时，必须使用正确的笔画结构和笔画数 — 黒 板 日 本 語 文 字 書 便 利。它们必须清晰可辨为真实的日语字符，而非臆造或简体中文的相似字。书写尺寸要大，以便笔画保持分离。"Seedance 2.5" 必须严格按照拼写以拉丁字母和数字书写：S-e-e-d-a-n-c-e，空格，2，小数点，5。粉笔颜色 — 仅限两种，绝无其他：黄色粉笔仅用于 "Seedance 2.5"。白色粉笔用于所有其他内容。布局规则（重要）：四行，左对齐至共同的左边距，从上到下均匀堆叠在黑板上，在结束时填满黑板。大型、开朗的手写粉笔风格，笔画略有不均匀。准确内容，从上到下： Seedance 2.5なら 黒板に日本語の文字を 書くことができます。 とても便利ですね 切勿居中对齐。切勿书写过小。每一行书写时应尽可能大，同时保持合适：完整的一行应跨越黑板几乎全部的可书写宽度，从左边距延伸至黑板右边缘附近，四行文字共同填满黑板从上到下的空间。字符宽大且间距充裕，以便密集的汉字如 黒 板 語 書 便 利 保持笔画分离且清晰可辨。如果某行无法容纳，请使字符变窄而不是变矮 — 切勿缩小行高使其仅占据黑板宽度的一部分。不要添加任何其他文字、符号、箭头、下划线或绘图。禁止事项：无字幕、无标题、无屏幕 UI、无水印、无背景音乐、无摄像机移动、无切换镜头、无额外人员、无第二只手进入画面、无空闲手中持有的粉笔、无已书写线条的变形。 [时间戳故事板] 0.0-3.6s 第 1 行 动作：她将教鞭抬至空白黑板的左上方，用黄色粉笔书写 "Seedance 2.5なら" — 先是拉丁字母和数字，然后是假名 なら — 痕迹紧随移动的尖端。语音（与书写同步）： 「Seedance 2.5なら」 意图：在品牌名称上眉毛有轻微的自豪上扬。这是她正在展示的内容。摄像机：锁定。无字幕。无背景音乐。仅日语。 3.6-7.2s 第 2 行 动作：她移至下一行，用白色粉笔一笔一画地书写 "黒板に日本語の文字を"。她的视线跟随自己的尖端。语音（与书写同步）： 「黒板に日本語の文字を」 意图：客观陈述，句子的前半部分。保持手臂平稳均匀。摄像机：锁定。无字幕。无背景音乐。仅日语。 7.2-11.0s 第 3 行 动作：她移至第三行，用白色粉笔一笔一画地书写 "書くことができます。"，最后以一个坚定的点结束句号。语音（与书写同步）： 「書くことができます。」 意图：这是句子的重点 — 她在 ます 处声音略微坚定，最后的句号以轻微而果断的敲击声完成。摄像机：锁定。无字幕。无背景音乐。仅日语。 11.0-15.0s 第 4 行 — 结尾 动作：她在底行用白色粉笔书写 "とても便利ですね"，然后将教鞭放下至身侧，脸完全转向摄像机，露出开朗温暖的微笑并清晰地点头一次。她保持该姿势直到最后 0.8 秒，保持静默。语音（与书写同步，在 14.2s 时结束）： 「とても便利ですね」 意图：点头即为结束。温暖，略带俏皮，仿佛在分享一个好的发现。摄像机：锁定。无字幕。无背景音乐。仅日语。 [结束约束 — 为整个片段重申]
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