Rikkai Heartline: Yukimura Chapter — An Interactive Otome Campus Romance
Play Rikkai Heartline: Yukimura Chapter — an interactive otome campus romance demo set on Rikkai's tennis courts after practice. Chat live with the tennis club captain, shape the dusk-first-encounter story with your choices, and watch tacit understanding, trust, and insight rise with every line. Free to play in your browser.
Final Product: Rikkai Heartline: Yukimura Chapter
Rikkai Heartline: Yukimura Chapter is a playable otome romance demo set on Rikkai's tennis courts after school. The last basket of balls is packed, the sunset paints the court lines gold, and the tennis club captain Yukimura Seiichi is still there — calm, warm, and quietly glad you stayed.
The story is written live as you play. Talk to him about anything, then face the three choices of Chapter 01 — help him look for the lost drawing page, admit what you saw, or wait quietly for him to speak first — and watch the tacit understanding, trust, and insight meters move with every line.
Play it now: Rikkai Heartline: Yukimura Chapter →
Game Features
- Live LLM Narrative — Every line of dialogue is written in real time by an LLM as you play. Yukimura answers what you type, remembers the mood of the sunset, and lets the conversation drift wherever you take it (deepseek-v4-flash real-time narrative).
- Free-Form Chat with the Captain — No scripted one-way replies. Ask about the iris drawing, tease him about practice, invite him to walk home, or stay quiet — Yukimura responds in character, in the moment, as if he were really standing beside you.
- Chapter 01: Dusk First Encounter — 夕暮初遇. Practice is over, the court empties out, and a half-finished iris drawing blows to your feet. Three choices — help him find it, admit you saw it, or wait for him to speak — set the tone of everything that follows.
- Relationship Meters — Tacit understanding, trust, and insight track how well you read him. Every message and every choice nudges the meters — and the story — in a different direction, run after run.
- Polished Otome Art — Cinematic sunset backgrounds of the Rikkai courts, full-body sprites of Yukimura in his forest-green and mustard-yellow team jacket, and warm 2000s sports-anime cel styling throughout.
- Browser Playable — Runs directly in your browser, no download needed. Save, menu, and home controls included — step back onto the sunset court anytime.
Character Sprites
Production Process Breakdown
AI receives the seed prompt — a female-oriented mobile romance game with live character interaction — and builds the world: the Rikkai campus romance setting, the sunset training court, and the original tennis-captain lead. The world is defined as a playable one-line adventure, ready to be brought to life.
AI designs the game and generates every art asset: 2 sunset tennis-court backgrounds, 1 game screen mockup, and 4 full-body character sprites of the captain (neutral, warm, quiet, tense). Each sprite was generated on a plain white matte background, then background-removed to transparent PNG via BiRefNet.
Game built and published with one click, instantly shareable online. The live LLM (deepseek-v4-flash) improvises the story in real time as you play — voicing Yukimura, narrating the dusk scenes, and reacting to every message and choice you make.
Scene Backgrounds
Real Generation Prompts
"Full-body anime character sprite of a gentle, slender Japanese middle-school boy tennis club captain, drawn in bright 2000s sports-anime TV cel style. CRITICAL identity features: soft WAVY SHOULDER-LENGTH dark blue-purple hair with a center part and loose curls framing both cheeks... holding a tennis racket loosely in one hand at his side. Calm serene closed-mouth expression... Plain pure white matte background, no props, no text, no logos, no watermark"
"Using the provided approved neutral full-body character sprite as the strict identity and composition reference, create the warm expression variant for the same youthful Japanese middle-school tennis captain. Preserve exactly the same face, dark indigo wavy hair, violet eyes, forest-green and mustard-yellow tennis team jacket... Change only his expression and very small natural gesture: a gentle sincere smile, softened eyes, faint warm blush... Plain pure white #ffffff background"
"Clean 16:9 visual novel background for a Japanese campus tennis romance game. Rikkai-style elite middle school outdoor tennis training courts at sunset after club practice, emerald wind screens, chain-link fence, school building and gym beyond the courts, a bench with folded towel and tennis ball basket, warm coral and lavender sky... Empty scene with no people and no character silhouettes"
"Clean wide visual novel background for a Japanese campus tennis romance game. An elite coastal middle school outdoor tennis practice court at sunset after club activities, deep emerald windscreens, chain-link fence, school gym and academic building beyond the courts, courtside bench with a folded white towel and ball basket, warm coral and lavender sky... Empty scene, absolutely no people or character silhouettes"
"2000s sports-anime cel style, polished Japanese otome game key art. Game cover for rikkai-heartline-demo — 'Rikkai Heartline: Yukimura Chapter'... A gentle slender middle-school tennis club captain with soft wavy shoulder-length dark blue-purple hair, violet eyes, wearing a forest-green and mustard-yellow tennis team tracksuit jacket... standing on an elite school tennis court at sunset with emerald windscreens... cinematic 16:9 composition with title copy space on the left. No text, no logo, no watermark, no UI"
Why Choose Neta Studio
Professional — Cloud harness system supports the full workflow from world building to game publishing, all running in the cloud with no local setup. Stable access to the latest models: Claude Opus 5 · GPT Image 2 · DeepSeek V4 Flash
One-click generation — Officially tuned skills drive every step: world building, character design, art generation, game packaging. World fork resource sharing.
Community-first — Users build unlimited worlds, all public worlds can be forked, remixed, reimagined.
Studio Interior
Start Creating
This game was generated by Neta Studio AI from a single sentence. The world took minutes. The game took minutes. You can do it too — adapt this world or start fresh from any IP. No coding required, free to start.
World: Rikkai Heartline · Type: Interactive Otome Romance Game · 4 character sprites · 2 scene backgrounds · 1 cover · 7 art assets · Share: Play →