Yu Yoshimuta
Portfolio of Yu Yoshimuta
About
Hi, I’m Yu Yoshimuta, a builder based in Tokyo.
I explore how AI can become a natural part of the way people think, create, and work.
I try to listen closely, question my assumptions, and learn from people who see the world differently from me.
- Based
- Tokyo, Japan
- Focus
- Design / Development
- Working on
- People and agents
Record
Selected projects, competitions, research, and other things worth keeping a record of.
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· OpenAI Build Week Hackathon
Global Build Week Community Event — Tokyo
1st Place
A Tokyo Codex hackathon held as part of OpenAI Global Build Week and hosted by OpenAI Codex Ambassador NUKO.
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· OpenAI × Onlab Pitch Competition
Series T — Post AGI from Kyoto
Top 50 Selection
Selected to the Top 50 for an OpenAI × Open Network Lab pitch event held during IVS2026 KYOTO.
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· Tokyo AI (TAI) Hackathon
Build with OpenAI: Developer Hackathon & Workshop
3rd Place
Hosted by Tokyo AI (TAI), with support from OpenAI.
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· FLUX × Rokid Japan Hackathon
FLUX × Rokid AI Glasses Hackathon
2nd Place · Jury Special Award
A ten-day build sprint using the Rokid AI Glasses SDK, co-hosted by FLUX and Rokid Japan.
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· AI Builders × TEAMZ Hackathon
TEAMZ AI Hackathon: Build OpenClaw AI Assistant
1st Place
Built and deployed an OpenClaw-based AI assistant at a Tokyo hackathon co-hosted by AI Builders and TEAMZ.
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· VoiceOS Hackathon
VoiceOS Hackathon Tokyo — Build Without a Keyboard
2nd Place
Built software with VoiceOS Agent Mode using voice alone, without keyboard input.
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· Business Contest KING
Spring Business Contest 2026
1st Place
Won a three-day student competition run by Business Contest KING, a student organization based at the University of Tokyo.
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· Impact Hackathon
Impact Tokyo Hackathon 2026: AI for Global Good
3rd Place
Built an AI solution in a problem-first, human-centered hackathon focused on measurable social impact.
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· JETRO Entrepreneurship Program
J-StarX UK Student Course
Selected Participant
Selected for JETRO’s entrepreneurship program and took part in a domestic bootcamp, online sessions, and a two-week on-site program in Oxford, United Kingdom.
Notes
Apologize: Regarding the designs of my page
A few days ago, I built, published, and shared this website online.
In doing so, I made three serious mistakes.
1. I copied another website’s visual style without permission or proper credit.
I was too lazy to design the site from scratch. I assumed that only a few people would see my post or visit the website, so I browsed Awwwards and found this site:
https://farfromhere.emmitfenn.com
I really liked it and decided that it would be “cool” to recreate the same style.
This was the exact prompt I used when I started the project:
“https://farfromhere.emmitfenn.com 音楽要素なくていいけど、これ参考に僕のポートフォリオサイト作りたい 立体のオブジェクトと二次元的模様を行き来する体験を再現したい 単に「カラフルな幾何学オブジェクトが中央にある」のではなく、複数の要素がひとつの彫刻を構成し、視点を回転・ズームして特定の角度に合わせると、隠れていた平面的な模様が成立するアナモルフォーシスが体験の本体です 一度こちらで最終的な2次元の模様を作ったので、それを使って まずどう実装するか練った上で教えて”
English translation
“https://farfromhere.emmitfenn.com I do not need the musical elements, but I want to create my portfolio website based on this site. I want to recreate the experience of moving back and forth between three-dimensional objects and two-dimensional patterns. The main experience is not simply having a colorful geometric object in the center. Rather, multiple elements form a single sculpture, and when the viewer rotates and zooms the perspective to a specific angle, a previously hidden flat pattern comes together through anamorphosis. I have already created the final two-dimensional pattern, so I want to use it. First, think through how this could be implemented, and then explain it to me.”
I intentionally tried to reproduce its concept and visual experience.
2. I failed to acknowledge what I had done.
At the very least, I should have clearly credited the original work and explained that my website was heavily based on it. Instead, even after my post received a lot of attention, I stayed silent and continued to present the project as though I had designed it entirely from scratch.
It was the first time one of my posts had received that much attention. I acted selfishly and convinced myself that no one would notice.
3. I took too long to apologize publicly.
After people began pointing out the similarities between the two websites, I should have removed the copied design and addressed the situation publicly without delay.
I contacted the original creator, Raphaël Améaume directly to apologize and waited for their response before making this public statement. That is part of the reason this apology took longer than it should have. However, waiting for their reply did not prevent me from acknowledging the issue publicly sooner. I should not have remained silent during that time.
I also considered whether I might be able to keep the project online if I received permission from the original creators after the fact. That was another mistake. Permission should have been obtained before publishing, and requesting it afterward would not undo what I had already done.
The copied design has now been removed from the website. The WebGL rendering is currently turned off and you will only see the simple html and css. I will replace it with a new design created entirely by me.
I am sorry to Raphaël Améaume and to everyone who saw, supported, or shared my work under the impression that the concept and design were my own. If you followed me because of this post or website, please unfollow me. I did not represent myself honestly, and I am not the designer you may have believed I was.
I will not delete the original promotional post. I believe I should leave a public record of what happened rather than quietly erase it. I will clearly add this apology and the necessary context to the post so that no one continues to mistake the design for my original work.
I take full responsibility for my actions. Going forward, I will properly credit my sources, ask for permission when necessary, and clearly distinguish between inspiration, reference, and original work even if it’s a very small project.
Building this portfolio
A short note on turning four flat patterns into one navigable three-dimensional object.
Today I finished the first version of this portfolio. It begins with one three-dimensional sculpture that resolves into four graphic patterns from four different viewpoints.
Hope you'll enjoy it:D
Contact
For projects, experiments, and conversations.