AI Collaborative World Building
Your Lie in April — AI World of Music, Memory & Second Movements
A complete world generated by AI from the canon of Your Lie in April — 22 atoms: 7 characters, 6 locations, 6 events and 3 rules of music, plus a playable visual novel and a full art library. The world is not the end point, but the starting point of all creation.
Contemporary Japan, a spring of soft light and hard goodbyes. Kousei Arima — once called a human metronome — lost the ability to hear his own piano the day his mother died. Then Kaori Miyazono, a wild and radiant violinist, crashes into his gray world under the cherry blossoms, dragging color, chaos, and an unspoken countdown back into his life. Around them move childhood friends, rivals, mentors, and the stages of junior competitions — concert halls, school corridors, riverside cherry trees, and hospital rooms — where love, jealousy, memory, and mortality press against every note.
Music here is not decoration; it is confession, rebellion, apology, and farewell. Kousei must reclaim music as living emotion rather than perfect technique, while Kaori uses brilliance, mischief, and a carefully kept lie to leave him a future she will not share — and every performance becomes a race between healing and irreversible loss.
Visual style: soft colored lineart, hand-drawn quality, soft pastel color palette. Kimi K3 GPT Image 2
7 characters generated from the canon of Your Lie in April, each with an independent backstory and musical voice. The six sprites below were auto-generated by GPT Image 2 with backgrounds removed.
Kousei Arima · Neutral — the human metronome who lost his music
Kousei Arima · Tense — fear of the keys returns
Kousei Arima · Warm — music starts to sound again
Kaori Miyazono · Neutral — the violinist who paints the world in color
Kaori Miyazono · Playful — mischief before every performance
Kaori Miyazono · Warm — the truth behind the smile
Characters
Kousei Arima
A former piano prodigy whose mother's death left him unable to hear his own playing, until Kaori drags him back into music and living color.
Characters
Kaori Miyazono
A free-spirited violinist who paints the world in color, lies about her crush to draw Kousei back to the stage, and hides a terminal illness behind every radiant performance.
Characters
Tsubaki Sawabe
Kousei's athletic childhood friend and neighbor, whose fierce protectiveness slowly reveals a love she never named until he begins to slip toward someone else.
Characters
Ryota Watari
A popular soccer captain whose easy charm and surprising sincerity make him both the bait in Kaori's lie and a steady friend when music and hearts collide.
Characters
Saki Arima
Kousei's late mother, a demanding piano teacher whose brutal training forged a prodigy and whose death left him unable to hear the instrument she forced him to master.
Characters
Hiroko Seto
A celebrated pianist and Saki's old friend who returns as Kousei's mentor, offering fierce honesty, maternal care, and a path back to music that is not built on fear.
Characters
Takeshi Aiza
A passionate rival pianist who once chased Kousei's legendary perfection and must confront the freer, wounded musician Kousei becomes under Kaori's influence.
Spring streets, school halls, and stages where silence and sound trade places — every location is a stage, from a riverside under falling petals to a hospital ward where love must speak without the safety of a spotlight. Each one carries an emotional stratum that can change a performance — or a life.
Riverside Cherry Blossoms — where Kaori arrives in color
Junior High School — friendships and invitations begin here
After-School Music Studio — the alchemy of rehearsals
Goshu Concert Hall — where technique is judged and confessions are played
Locations
Riverside Cherry Blossoms
A stretch of riverbank where soft pink petals fall like slow confetti, marking meetings, confessions, and the fragile season that defines this story.
Locations
Junior High School
The everyday campus of classrooms, rooftops, and after-school routes where friendship, jealousy, and invitations to perform begin before any stage lights rise.
Locations
Goshu Concert Hall
A formal competition venue where technique is judged, reputations crack, and Kousei and Kaori transform classical pieces into public confessions.
Locations
Arima Home Practice Room
The quiet house and piano room where Saki's discipline once ruled, where dust gathered on keys, and where Kousei must sit again with both trauma and returning sound.
Locations
Hospital Ward
The pale, timed-beeping rooms where Kaori's hidden illness becomes undeniable and love must speak without the safety of a stage.
Locations
After-School Music Studio
A modest practice space for violin and piano rehearsals, arguments over interpretation, and the messy alchemy that turns two teenagers into one unforgettable sound.
The Day the Piano Went Silent
After Saki Arima's death, Kousei freezes mid-performance and loses the ability to hear his own playing, beginning years of monochrome withdrawal from the stage.
Kaori Arrives in Color
Kaori Miyazono enters Kousei's circle under cherry-blossom season, claims she likes Watari, and detonates his gray routine with laughter, demand, and violin fire.
The Duo That Breaks the Rules
Kousei and Kaori's competition performances scandalize judges and electrify audiences, proving that imperfect, living music can wound and heal more deeply than perfection.
The Hospital Truth
Kaori's collapsing health can no longer be hidden; hospital visits replace rehearsals, and the bright lie that brought Kousei back begins to crack under mortality.
The Lie Revealed
Kaori's claim that she loved Watari is exposed as a deliberate fiction designed to reach Kousei without frightening him away, reframing every shared moment as intentional devotion.
The Final Performance and Farewell
Kousei plays on with Kaori's absence and presence intertwined — a last shared music in spirit, a letter of love, and a life that must continue in full color.
Lore
Music as Emotional Language
In this world, performance is never only skill: a phrase can confess love, a silence can hold trauma, and a shared tempo can say what teenagers cannot yet speak.
Lore
The Beauty of Ephemeral Things
Cherry blossoms, brief performances, youth, and Kaori herself embody a law of the world: what vanishes too soon can still stain a life permanently with color.
Lore
The Human Metronome's Curse
Kousei's childhood title names both his gift and his prison: music reduced to flawless timing until grief breaks the mechanism and forces a freer, riskier art to be born.
World Rules
Music as Emotional Language
Performance is never only skill — a phrase can confess love, a silence can hold trauma, and a shared tempo can say what teenagers cannot yet speak.
The Beauty of Ephemeral Things
Cherry blossoms, brief performances, youth, and Kaori herself embody a law of this world: what vanishes too soon can still stain a life permanently with color.
The Human Metronome's Curse
Kousei's childhood title names both his gift and his prison — music reduced to flawless timing until grief breaks the mechanism and forces a freer, riskier art to be born.
Twelve works have been generated from this world — 1 playable visual novel game (April Lie: First Duet), 6 character sprites with expression variants, 4 scene backgrounds and 1 title background. The world is the source; works are its branches.
April Lie: First Duet — playable visual novel: Kaori challenges the human metronome (real gameplay)
Kousei Arima · Neutral — in-game sprite, background removed
Kousei Arima · Warm — in-game sprite, background removed
Kaori Miyazono · Neutral — in-game sprite, background removed
Kaori Miyazono · Playful — in-game sprite, background removed
Kaori Miyazono · Warm — in-game sprite, background removed
Kousei Arima · Tense — in-game sprite, background removed
Riverside Cherry Blossoms — scene background
Junior High School — scene background
After-School Music Studio — scene background
Goshu Concert Hall — scene background
April Lie: First Duet — title background at dusk
This world is public. You can Fork it — inherit all 22 atoms, all characters and scenes, rewrite what you want, and publish your own version.
Remove the tragedy, add a new rival. Replace spring with autumn, the concert hall with a street corner. Swap soft pastel lineart for watercolor. The world is your asset library — rewriting is creation.
Collaborative workflow
Fork world → Edit atom cards → Generate new games/videos/assets → Publish → Others can Fork your version
World building · TextKimi K3Claude Opus 5
One sentence → 22 atoms: 7 characters, 6 locations, 6 events, 3 rules of music.
Art generation · ImageGPT Image 2
Character sprites (auto background-removed), scene backgrounds, game covers.
Video generation · AnimationSeedanceKling 2.5
Title animations, character entrance effects, scene transitions.
In-game dialogue · Real-time narrativeDeepSeek V3Kimi K3
Real-time LLM generates narrative in character voice. Freely switchable.
Title background — April Lie: First Duet
Cinematic 16:9 visual novel title background, soft colored lineart anime quality, soft pastel spring palette. Wide riverside at dusk under falling cherry blossom petals, soft pink sky reflecting on quiet water, distant concert hall silhouette with warm window lights, empty romantic composition with dark quiet lower third for title text overlay, no people, no characters, no text, no logo, no UI, no watermark, painterly atmospheric anime scenery.
Kaori Miyazono — sprite source
Full-body visual novel character sprite source for AVG. One young woman standing upright, entire body visible head to shoes, centered with generous margin. Plain pure white matte background #ffffff only. Soft colored lineart, hand-drawn anime quality, soft pastel palette. Blonde long wavy hair, bright expressive eyes, gentle neutral expression, light spring blouse and flowing skirt in soft pink and cream, school-casual anime style inspired by musical drama aesthetics. Clean silhouette for cutout. No scenery, no gradient, no props text logo watermark UI frame.
Goshu Concert Hall — scene background
Clean visual novel scene background only, 16:9, soft colored lineart anime quality. Grand concert hall stage from performer view toward dark audience seats and warm stage lights, polished floor, dramatic soft spotlight, empty of people characters text UI logos, emotional musical drama atmosphere.
In Neta Studio, a world is the beginning of everything. A world contains characters, locations, events, and the rules that bind them — all generated by AI from a single sentence, all referenceable, rewritable, and expandable.
World → Game
Select a storyline from world cards, AI auto-writes game logic, generates art, builds a playable visual novel — just like April Lie: First Duet.
World → Video
Generate dynamic videos from world characters and scenes — title animations, character entrances, scene transitions.
World → Assets
Each character auto-generates a sprite, each location auto-generates a background. The world itself is an asset library.
Create from this World
Inherit 22 atoms, rewrite what you want, create your own April.
World: Your Lie in AprilType: Anime World · Musical DramaAtoms: 22 (Characters 7 · Locations 6 · Events 6 · Lore 3)Works: 12 (Game 1 · Sprites 6 · Backgrounds 5)Models: Claude Opus 5 · GPT Image 2 · DeepSeek V3
