はじめに
近年、生成AIの進化によって、アート表現は新たなフェーズに入りました。とりわけ「夏の情景」と「美少女」という日本カルチャーに根ざしたテーマは、AIによるビジュアル生成と非常に相性が良く、多くのクリエイターに注目されています。本記事では、Midjourneyを使って夏のグラビア美女・美少女を生成するためのプロンプト文例を多数紹介します。
Midjourneyとは？美少女生成における強み
Midjourneyは、テキストから高精細なイラストやフォトリアル画像を生成するAIサービスです。美少女表現やアニメ調のテイスト、シネマライクなライティングなど、幅広い表現力を持ち、生成された画像はSNS映えも抜群です。
夏の美少女を表現するためのキーワードと世界観
「夏」をテーマにした美少女を描くには、次のようなキーワードの組み合わせが有効です。
- 季節感ワード：sunset, beach, fireworks, sunflower, cicadas
- 衣装系：bikini, yukata, school uniform, summer dress
- 雰囲気系：nostalgic, cinematic lighting, dreamy, lens flare
Midjourneyの始め方
Midjourney（ミッドジャーニー）は、テキストベースのプロンプトを使ってAIが美しい画像を生成するツールです。特に美女や魅力的な人物を描くのに優れており、クリエイティブなプロジェクトに最適です。写真のようにリアルな表現から、幻想的なアートスタイルまで、幅広いビジュアルを簡単に作成できます。
Midjourneyの始め方については、過去記事の「画像生成AI「Midjourney」の始め方をイチから解説」で詳しく解説していますので、Midjourneyをイチから始めてみたいという方は、ぜひご一読ください。また、「ミッドジャーニーのコマンド一覧、コマンドの使い方まとめ」では、Midjourneyの細かい使い方を説明していますので、こちらも合わせてご覧いただくとよいです。
美少女＆グラビア美女を生成する際の基礎知識
プロンプトの基本構成要素
プロンプトは、5つの基本構成要素を意識して組み立てると、意図した画像が生成されやすくなります。
| 構成要素 | 説明 | 例 |
| ① 主題（人物） | 美少女、グラビアモデルなど | a beautiful anime girl、realistic gravure idol |
| ② 衣装・外見 | 水着、浴衣、夏服、髪型・表情など | in a white bikini、wearing a yukata with floral pattern |
| ③ ロケーション | 海辺、ひまわり畑、祭り、夕焼けなど | on the beach at sunset、in a sunflower field |
| ④ 雰囲気・描写 | 光、空気感、色味、ボケ、映画的演出など | soft lighting、cinematic atmosphere、warm tones |
| ⑤ 技術指定・スタイル | アスペクト比、バージョン、スタイル、アーティスト名など | --ar 16:9、--v 6、by Makoto Shinkai |
プロンプト作成のコツと注意点
夏の美少女やグラビア美女を生成AIで描くには、「主題＋衣装＋ロケーション＋雰囲気＋スタイル指定」という構成要素を意識することで、誰でも美しく高品質な作品を生み出すことができます。
そして、プロンプトの設計においては、季節感の演出・描写の精度・規約配慮・情報整理が成功のカギとなります。
コツ①：季節感を明確に出す
「夏」を表現するには、「光」と「空」の描写が肝心です。
- 時間帯を明記：
sunsetmidday sunなど - 光の質感を加える：
golden hour lightingsoft glowなど
例）
at golden hour, glowing sunlight reflecting on water, warm summer tones
コツ②：衣装と雰囲気に統一感をもたせる
たとえば、浴衣には「夜」や「花火」といったロケーションが自然です。水着には「海」「空」「波」などの要素がフィットします。
- 浴衣 × 夜空 × 花火
- 水着 × 青空 × 砂浜
- サマードレス × ひまわり畑 × 青い風
コツ③：アスペクト比とスタイルを活用する
Midjourneyでは、生成する画像の縦横比（アスペクト比）や表現スタイルを細かく指定することで、用途やイメージに合った作品を作ることが可能です。
画像の縦横比は、作品の印象や使用するメディアに直結します。
- SNS用 →
--ar 4:5（Instagram向け） - 横長ブログ用 →
--ar 16:9 - よりリアルな絵 →
--style photographic - アニメ調ならアーティスト名を追加（例：
by Makoto Shinkai）
例）海辺に立つ美少女の横長構図
a girl in a swimsuit standing on the beach at sunset, cinematic atmosphere --ar 16:9 --v 6
夏の美少女を生成するプロンプトテンプレート
使用したプロンプトはこちら▼
＜prompt＞
Beautiful 18 year old Japanese girl, tank top, hot pants, park, special smile, B95 W55 H85 --ar 2:3
使用したプロンプトはこちら▼
＜prompt＞
Beautiful young Chinese woman in a LIGHT YELLOW dress with flowers on the shoulders, plump chest, and neck. Her skin is glowing in soft light, and her long hair is flowing behind her. This is a full-body photograph with a sky background and white clouds. The photography is professional, with perfect details and high-definition quality. The woman's expression is natural, and her facial features are delicate. --profile 6zxi4ir
使用したプロンプトはこちら▼
＜prompt＞
photoshoot, beautiful cute japanese actress woman in pool party dress "dinking yuna", short hair with bangs and smile, kawaii style, instagram post --ar 17:23
使用したプロンプトはこちら▼
＜prompt＞
full-body portrait of a very cute 20-year-old Japanese woman with short brown hair, sitting by the edge of a pool in summer, her feet gently dipped in the water, wearing a light and breezy casual summer outfit, soft smile, bright eyes, peaceful and gentle expression, playful and relaxed gaze, dazzling summer sunlight reflecting on the water, cinematic lighting, natural skin texture, highly realistic photo style --ar 9:16 --raw
使用したプロンプトはこちら▼
＜prompt＞
full body portrait of a 25-year beautiful Japanese girl, standing in the streets of Gion Kyoto, wearing light clothing, straight black hair, natural makeup, gentle and warm smile, traditional Japanese background, soft natural lighting, photorealistic, ultra high detail, 35mm photography, 8k --ar 19:16
使用したプロンプトはこちら▼
＜prompt＞
A young Japanese woman in a yukata with a traditional floral pattern, standing by a river at night, watching fireworks. Bright fireworks in the sky, warm glow, cinematic lighting, summer festival atmosphere, 3:2 aspect ratio, high detail, realistic, soft bokeh --ar 6:7
使用したプロンプトはこちら▼
＜prompt＞
A dynamic close-up shot from the waist up of a tall, young Korean woman running directly toward the camera beneath the eaves of a traditional Japanese house on a tranquil Kyoto street. Her face is framed by long, straight, airy black hair with soft, wispy air bangs gently sweeping across her forehead, some strands flowing back with her movement. She has a delicate, youthful face shape with a softly rounded jawline, a small and refined chin, and gentle, smooth facial contours. Her facial features are perfectly balanced and doll-like--symmetrical almond-shaped eyes sparkling with lively energy, gracefully arched eyebrows, a delicate nose, and full, naturally curved lips slightly upturned in a confident, joyful smile. Her skin has a smooth, luminous, and natural Asian complexion, with a healthy, soft glow and a hint of blush on her cheeks. Fine details such as natural skin texture and long lashes are clearly visible. She wears a summery, floral-patterned spaghetti strap dress, the thin straps visible at her shoulders. The background remains softly blurred, showing the wooden beams and roof tiles of a classic Japanese house, still glistening with fresh raindrops. Soft, diffused afternoon light filters through the moist air, casting gentle reflections and a subtle mist. Puddles shimmer on the stone pavement, enhancing the fresh, peaceful atmosphere. The focus stays on her upper body and expressive face as she runs, capturing the sense of motion and joyful energy while preserving the serene, timeless Kyoto ambiance. --ar 3:4 --profile qqlf6fu
使用したプロンプトはこちら▼
＜prompt＞
an young japanese woman, wearing white suspenders and posing next to a wooden pole in front of her chest. The background is outdoors, She has delicate facial features and bright eyes that exude confidence. smiling softly, instagramer --ar 51:64 --raw
使用したプロンプトはこちら▼
＜prompt＞
A photo of a lovely Japanese woman wearing a yukata going to a fireworks festival in Japan. Fireworks festival atmosphere. Realistic --ar 19:16
使用したプロンプトはこちら▼
＜prompt＞
full-body shot, young japanese female fashion model portrait, smiling face ,wearing swimming suit, in the beach --ar 2:3 --raw --stylize 50
使用したプロンプトはこちら▼
＜prompt＞
A dramatic close-up shot of an idol-cute Japanese high-school girl with a neat short bob and sweat-damp short-sleeve white summer blouse. She kneels barefoot on sun-warmed tatami, golden midsummer light streaming in from the open shōji behind her. Beads of perspiration glisten on her collarbones and soak the fabric at her chest. Leaning slightly toward the lens, she lifts a bright red half-moon slice of watermelon with both hands and bites into it with a wide, joyful smile--juice splashing, seeds suspended mid-air. The camera angles from just above the fruit, filling the frame with her glowing face, sparkling eyes, and the vivid crimson of the watermelon against the white blouse. The blurred background hints at the sun-bleached wooden engawa and lush green garden beyond, while dust motes drift in the back-light. Pastel summer palette, shallow depth of field, and subtle 35 mm film grain capture the electric, carefree sparkle of youth on a sweltering August afternoon. --ar 2:3
使用したプロンプトはこちら▼
＜prompt＞
An animated poster illustration in Studio Ghibli style. A pure, cheerful young woman stands in the sparkling shallow ocean, holding a can of Pocari Sweat, smiling brightly. She has short black bobbed hair fluttering in the breeze, and wears light denim shorts with a loose-fitting white oversized T-shirt. The sea glistens with reflected sunlight, creating a magical, refreshing atmosphere. The sky is a soft pastel jade green (celadon-like), filled with large, fluffy white cumulus clouds drifting in the background. The scene radiates summer energy, health, and joy, with hand-painted textures and soft light. --no text, photorealism, logos --ar 19:16 --raw --profile p3igu93
使用したプロンプトはこちら▼
＜prompt＞
a glamorous japanese female fashion model in a marine-inspired summer outfit, smile broadly, sitting at an outdoor seaside terrace café, wearing a sleeveless navy and white striped boatneck top, high-waisted white denim shorts with gold buttons and rolled hems, a red silk scarf tied around her neck, navy espadrille sandals with white lace-up straps, a straw boater hat with a navy ribbon, canvas tote bag with anchor embroidery hanging from the chair, she holds a glass of iced lemonade with condensation, gazing out toward the sparkling ocean, sunlight reflecting off the waves, wooden deck beneath her feet, white parasol providing gentle shade, light breeze moving her hair, realistic summer lighting, elegant and relaxed atmosphere, full body shot, cinematic composition --ar 11:16 --raw --profile eqobjir --stylize 90
使用したプロンプトはこちら▼
＜prompt＞
a japanese confident glamorous woman wearing a whimsical pineapple costume, holding a fresh pineapple and striking a playful pose, smile broadly, short blond bob haircut, standing on a tropical beach at golden hour, sun flare lighting, vivid colors, cheerful expression, cinematic composition, fruit-themed fashion editorial style, whimsical and stylish, ultra high resolution, professional photography, tropical flower --ar 2:3 --raw --profile eqobjir --stylize 80
使用したプロンプトはこちら▼
＜prompt＞
最高金賞の写真, ポートレート, かわいい, 愛らしい, 日本人女子, 20歳の女性, 遠くから見つめる, あの日, 君に夢中, 恋をした, ネモフィラの丘, 一眼レフで撮影, 最高傑作 --no 着物, リュック, カメラ, 古い, 最低品質 --ar 2:3 --raw
使用したプロンプトはこちら▼
＜prompt＞
noon, sky, huge cloud, a Japanese high school girl looks up the sky, bob haircut, sight of back, on the water, Sony A7RV, 70200gm2 lens --ar 8:5
使用したプロンプトはこちら▼
＜prompt＞
digital photo,Surrounded by beautiful, colorful hydrangeas glistening from the rain, an elegant 18-year-old Japanese girl inspired by Nogizaka46, wearing a glamorous kimono with luxurious embroidery. She has a cute and pretty face with round eyes, and she holds a traditional Japanese umbrella (wagasa) that is wet from the rain. Captured in a side profile during rainy weather --no retro --ar 4:5 --stylize 250
使用したプロンプトはこちら▼
＜prompt＞
young woman in her early twenties, seen from behind, wearing a light summer dress, sitting on the engawa of a traditional Japanese kominka house, enjoying the coolness of a summer evening, foreground with blooming sunflowers and lush native grasses creating organic depth, surrounded by quiet rice fields and distant countryside, natural Japanese rural atmosphere, layered composition with strong natural perspective and soft depth of field, realistic textures of moss-covered stones, wooden veranda and soil path, transparent reflections on water surface, background with hazy hills and soft orange evening sky, small glowing particles subtly floating in the air like insects, soft bloom of light in a nostalgic and calming mood, photorealistic style with watercolor-like softness and transparency, gentle brushstroke textures, natural diffusion of light and color, emotionally rich and peaceful atmosphere, cinematic postcard-like vertical composition, unseen and timeless Japanese rural dreamscape --no oil painting, painting, rough brushstrokes, impressionist, human, anime-style illustration --chaos 40 --ar 9:16 --raw --profile 2hosbgw --stylize 200
使用したプロンプトはこちら▼
＜prompt＞
Japanese, Nogizaka46, walking on a sidewalk with a view of Tokyo Station, blue sky, small face, perfect makeup, eye makeup, ash brown long wavy hair, female, 20yo, skirt with slit, smiling, quadriceps, thigh adductor muscles, hamstrings, knees, --ar 9:20 --profile o1ga8bv
使用したプロンプトはこちら▼
＜prompt＞
A Korean teenage girl who looks like a K-pop idol on her summer day off, with long soft brown hair and straight bangs, smiling naturally with teeth showing, wearing a crisp white crop tee and light blue high-waisted denim shorts, white sneakers, carrying a mini crossbody bag, sunglasses pushed on her head, standing casually in a shaded sidewalk with soft clear daylight, looking relaxed and stylish, photorealistic, high-resolution, effortless K-pop casual look --ar 19:16 --raw
使用したプロンプトはこちら▼
＜prompt＞
an aesthetically composed Instagram-style vertical photo of a Japanese woman in her early twenties walking from left to right along a narrow concrete seawall beside the Seto Inland Sea, photographed from the side in soft natural sunlight. She wears a flowing white summer one-piece dress and a floppy straw sun hat with long ribbons fluttering in the breeze. A small cat walks closely at her side, their steps in quiet harmony. The seawall runs horizontally across the lower third of the frame, while the sky and sea dominate the background a vivid blue sky with soft white clouds and a shimmering, transparent blue sea stretching out behind them. In the distance, a triangular green mountain rises gently across the water. Her hair and dress catch the light and movement of the wind, adding softness and motion to the frame. The overall composition is airy, minimal, and stylish, evoking a serene and poetic summer day in Japan. Balanced lighting, natural colors, gentle contrast, shallow depth of field, and subtle bokeh enhance the cinematic and editorial feel --ar 9:16 --profile mlbumcb
使用したプロンプトはこちら▼
＜prompt＞
a beautiful Japanese high school girl with short black hair, wearing a soaked white school uniform shirt with a dark blue ribbon and a plaid skirt, walking through rainy Shibuya streets, seen from a natural 3/4 angle with a slightly low perspective, smiling with a shy gentle expression, her wet hair softly clinging to her face, neon lights reflecting on wet pavement, umbrellas and blurry pedestrians in the background, emotional and cinematic mood, hyper-realistic detail --ar 9:16 --raw --profile w36iobo
使用したプロンプトはこちら▼
＜prompt＞
A full body shot of a beautiful Asian woman with short black bob haircut, wearing grey-tinted sunglasses with red glasses frames, wearing a red-white checkered cropped t-shirt, and red-white checkered ruffle shorts, striking a cute and playful pose while smiling joyfully on a sunny beach, the turquoise sea and cloudless blue sky forming a vibrant and tranquil backdrop, captured during a hot summer afternoon, shot with a Sony Alpha 7R V, 70-200mm f/2.8 lens, vivid tropical color tones with sharp focus and soft skin highlights --ar 2:3 --raw --profile 1gmkjke ev5ewji --stylize 1000
使用したプロンプトはこちら▼
＜prompt＞
A very cute Japanese high school girl in a summer school uniform, shown in a close-up portrait. She has soft short bobbed black hair with light bangs, big expressive eyes, and a gentle, innocent smile. She wears a white blouse with a light blue ribbon, a navy mini skirt, and white knee-high socks. The background is softly blurred, hinting at a schoolyard in summer. The lighting is bright and natural. The camera is close, focusing on her face and upper body, with a slight tilt for a cinematic effect. Highly detailed, anime-style, ultra high quality, kawaii aesthetic, soft lighting. --ar 11:16
使用したプロンプトはこちら▼
＜prompt＞
リアルなフィルム写真、正面からの撮影、リアルな19歳の日本女性の有名なモデル、真夏の薄い生地の服装、曲線的な体型、ふくよかな体型、豊かな体型、細身、自然で気取らない表情、小さい笑顔、茶髪、スタイリッシュなファッションセンス、外で自然に四つん這いになっている、高解像度、超細密、生写真、 美しい色調、プロの照明、傑作、16K、8K、HDR、FHD、UHD、ethereal soft light with cool undertones, slight overexposure creating luminous glow, diffused morning light at 6000K, gentle backlighting through white sheer material, subtle blue-white rim lighting outlining silhouette, minimal film grain, high-key treatment with lifted shadows, very subtle soft focus effect, delicate white haze around bright areas, milky translucent quality, slight bloom effect on highlights, clean whites with barely-there texture, --no wavy hair, curly hair, loose curls, tousled hair, hands, camera, Anime, manga, painting, drawing, kimono, Arm Raise, eye shadow, freckles, cheek, tattoo, old photo, makeup, Big Eyes, worst quality, low quality, normal quality, lowres, skin spots acnes, skin blemishes, monochrome, illustration, painting, 3D game, NOT with warm tones, NOT with strong contrast, NOT with deep shadows, NOT with visible skin texture, NOT with saturated colors, NOT with yellow undertones --chaos 2 --ar 2:3 --exp 15 --raw --stylize 80
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