00
About uuhai
I work a regular office job. Everything on this site is a side project I build alone, in the gaps between work and on weekends. I can't draw, and I've never made a video. What got me started was simply how interesting it felt that generative AI had come so far in just a few years that one person could create a character, turn it into stickers, put it in a picture book, and build tools and videos around it too.
One thing I care about is not showing only the parts that worked. Honestly, most of my prompts don't come out the way I want, and I've scrapped plenty of characters and ideas partway through. I put all of that out here, the trial and error and the bad calls included, in the hope that it's useful as an "experiment log" for anyone curious about side projects or making things on their own.
I'm running the nine projects in the contents above in parallel. Each one is an experiment in how far AI can take me; some stall, some take shape. This page is the work in progress.
This English page is updated less often than the Japanese page, which has the latest list.
- Operator
- uuhai (solo, side-hustle operation)
- Started
- 2026
- Why work on so many different things at once?
- Because the point isn't to pick one thing I'm good at. It's to see how far one person can stretch with generative AI. Each genre has its own process and its own difficulties, so I keep going with all of them and compare as I go.
- Is everything made with AI?
- I handle the planning, the concepts, and the final quality checks myself. I use generative AI heavily for illustration, first drafts of text, video generation, and so on, and I say so clearly on each piece of content.
- How often do you update?
- It depends on the line. note gets a post every day, and picture books and the rest are updated whenever production gets there.
02
note
Daily posts in two categories: plain-language takes on AI industry news, and behind-the-scenes notes from my own projects, including the failures and test logs. The first kind is me following what's happening in AI and breaking down what I've learned in my own words, without leaning on jargon. The second is the messy side of actually making things: prompts that didn't work, wrong turns I took along the way, written up as they happened. I keep both going because I think a work-in-progress is sometimes more useful to someone than a tidy summary.
03
Picture Books (Amazon KDP)
A series of children's picture books illustrated with generative AI, with five volumes out so far (Japanese and English editions) and a sixth in the works. I started it as a challenge to do the whole thing myself, from generating the illustrations to writing the text to self-publishing on Kindle, with nothing outsourced. I try to keep the stories gentle and easy for a child to follow, and every volume is also a lesson in keeping AI-generated art consistent from page to page.
05
Chrome Extensions
These are tools I wanted for my own work, turned straight into products. They all started as things I built just for myself after thinking "this would be so much easier if I had..." during everyday tasks, like managing prompts or capturing screenshots. I only release the ones I actually kept using, so the feature lists are short, but the use case for each should be obvious.
06
One-Time-Purchase Tools
Small web tools sold on BOOTH as a one-time purchase, not a subscription. I'm sticking with pay-once on purpose, because a tool that solves one small problem shouldn't need a recurring charge. These are niche calculators and checkers I actually wanted myself, like a LINE sticker pre-submission checker and a fee comparison for creators, built with only the features they need.
The full, up-to-date list of tools is on the Japanese page.
07
Video
A series of short AI-generated films set in a world where Japanese tradition meets cyberpunk. I'm seeing how far I can push a setting that blends Edo-period design with a near-future cyberpunk city, using AI video generation alone. It's also a record of whether one office worker who can't shoot or draw can turn prompt trial and error into something that holds up as a film.
08
Investing Blog
A blog where I research and summarize savings systems like NISA, accounts and paperwork. I don't give buy or sell advice; I just share what I looked into and how things compare.
09
Camera Maigo Note
A beginner guide for people unsure about cameras: before buying, bought but not using it, or wondering whether to keep going. I don't own a camera myself, so it isn't written as personal experience. It compiles what people have said online and manufacturers' public information, with sources. AI is used to write the text. The site is in Japanese only.
