JPEN

CHARACTERAMI OTSUKA

Ami Otsuka

《Defender of the Evening Pool》

PROFILE
Portrait of Ami Otsuka
Birthdate of birth
2001.08.04Japan
Basehabitat
ThailandMostly livingin resort hotels!
Schooluniversity
Chuo University
Rolesoccupation
Writer, Engineer, Entrepreneur
Skillspecial ability
Splashing aroundin a pool
Wishwhat I want
An airplane
Voice

“While I'm at the spa, is the AI actually working?”

Voice

“While I'm at the spa, is the AI actually working?”

Character Status

Character status

Authority SFunds ADiligence FStamina ESlacking S+LIMIT BREAK!!
CHA

Authority

S

Overwhelming leverage from Forbes, a bestseller and talks at major companies

GOLD

Funds

A

Enough to keep living in hotels and travelling the world

LAZY

Diligence

F

Merely learning that an exam exists is enough to break her

VIT

Stamina

E

Extremely low: even getting changed is too much effort

LUK

Slacking

S+

Limit broken. A talent for building systems in order to slack off

Items

Favourites and landmines

Things that heal on contact, and things that kill instantly if you step on them.

Favouriteshealing items
  • Notifications that AI earned money on its own
  • Buffets
  • Spa treatments
  • Uber Eats
Landminesthings that deal damage
  • Reports with no evidence
  • Grit-and-willpower speeches
  • Physically moving
  • Pointless endurance

Main Quest

Humanity's greatest unsolved problem

VISION

Defend the one hour of pool at dusk.

MISSION

Humanity (me) is running out of time.

  • ☀️Too hot (I don't want a tan)
  • 🌙Too dark (feels like ghosts come out)
  • 👙Too much hassle (no stamina to get out of bed and change)

The only window where I can safely play in the pool is 18:00–19:00 — exactly one hour. That this precious freedom is being taken from me is humanity's greatest unsolved problem.

OUR APPROACH

So I stopped working.

  • Annoying work ➡ throw all of it at the AI.
  • Hard engineering ➡ summon a serious grown-up (the CTO).

My money, my clever AI and my staff all exist for one reason: so that nobody interrupts that one perfect hour at dusk.

Story

Career — from university to now

Ami Otsuka studied at Chuo University. From October 28, 2023 to February 4, 2024 she built one app every day and posted each one on X, finishing the #100DayChallenge with all 100 shipped. During that run she received the 2023 Young Researcher Encouragement Award in network software from IEICE, and in September 2024 the Special Award for AI Supported Education at IEEE CogInfoCom 2024. In January 2025 Nikkei BP published her book on the challenge, which has since appeared in Korean and Traditional Chinese editions. Her book “I Dumped Everything on AI” comes out from Shinchosha on October 21, 2026. Open a card and you get the honest version, lifted from my diary and my analysis documents.

EP.01Met generative AI

Started using ChatGPT as a partner that helps me think and build things.

the honest versionI begged the AI for help because I wanted my report over with. I threw every annoying thing at it, and for some reason the grown-ups started calling that “a new way of learning.”

noteFrom slacking student to conference speaker: 100 apps with ChatGPT (note, Japanese)

EP.02Won an award for a conference talk

Presented my research and won the Young Researcher Award of the Network Software workshop. The researcher class unlocked.

the honest versionJust saying “I won an award” changed how adults treated me. It felt like picking up a handy pass that skips the tedious explaining.

noteNo inspiring story needed. My first win, taken with AI (note, Japanese)

EP.03Finished the 100-Day Challenge

Day one was Othello. From there, one game or app built and published every day for 100 days.

the honest versionI wanted attention. I kept going out of vanity — quitting would have been uncool — and before I noticed, the AI, the diary and the code had turned into a pile of material.

noteIndex: every one of the 100 works from #100DayChallenge (note, Japanese)

EP.04Joined an IT company

Graduated and joined as a new grad, equipping the mask of a salaried employee. Turned onboarding and company life into an observation subject.

the honest versionTraining was boring and I stuck out at the office. Playing a normal working adult hurt, so I turned it into a place to collect material while being paid a living.

noteCorporate tutorial: what eight months inside a big company taught me (note, Japanese)

EP.05Started writing “#100 Day Challenge”

Began turning 100 days of work and diaries into a book.

the honest versionI wanted freedom, I wanted to be fussed over, I wanted out of a normal timetable. AI and an editor turned that desire into something shaped like a book proposal.

noteI was just keeping a diary, and somehow became an author (note, Japanese)

EP.06Judges' Special Award at an international conference

Received the Judges' Special Award at IEEE CogInfoCom, and a path to working worldwide came into view.

the honest versionIt gave me more reasons to go abroad and more material to inflate my profile. The practical upside came into focus before anything else.
EP.07Founded Hundreds LLC

Set up my own company so work could be taken on by the company.

the honest versionHandling everything personally got annoying. Also, “we do it as a company” sounds more like a young founder, and looks properly put together. Putting myself in a box instantly changed how adults behaved.

noteThrough the tedious paperwork: how I set up my company (note, Japanese)

EP.08“#100 Day Challenge” published

Published by Nikkei BP. It became a bestseller, and talk and interview requests increased.

the honest versionJust saying “I'm an author” makes adults listen the first time we meet. It works like a very thick business card that lets me skip most of the explanation.

notePrologue: can skipping homework with AI make you an engineer? (note, Japanese)

EP.093rd place at a U.S. app-development contest

3rd place in a U.S. hackathon with 55,000 entries, and a prize of about $5,000. Proof, as a result, that I can build my own apps.

the honest versionI didn't want to be underestimated. If a profile can be upgraded in one shot, using AI, money and every grown-up around me was simply faster.

note3rd place at the U.S. app festival “Shipathon 2025” (note, Japanese)

EP.10Founded a U.S. entity

Set up Hundreds US, LLC in the United States to make overseas work easier to take on.

the honest version“It's a U.S. company” sounded strong. Titles are clothes, so I changed into something that looks stronger.
EP.11Moved to Thailand

Left Japan and started living in a hotel with a pool in Thailand.

the honest versionI want the spa and the pool. I don't want to do housework. I want out of the tiresome air in Japan. I asked the AI, and my living conditions came out as “hotel with a pool, airport, spa.”

noteThe full record of leaving Japan, decided with AI in one week (note, Japanese)

PICK UP (note)

Now

What she does now

Ami now lives in Thailand and works across writing, speaking, app development, corporate training and joint research. In September 2025 she gave the keynote at PyCon JP 2025 and released her app MemoLune on the App Store the same month. In March 2026 Forbes JAPAN named her one of its Women In Tech 30. Her book “I Dumped Everything on AI” comes out from Shinchosha on October 21, 2026.

Base
Thailand. Living in hotels with a pool.
Company
CEO of Hundreds LLC (founded December 2024). Founded Hundreds US LLC in January 2026.
Work
Writing, talks and corporate training, app development, joint research.
Channels
Writing on note and X.

RECORD

Awards

Only what passed a review, each with a date and a source.

RECORD

Books

Nikkei BP, Amazon and BOOTH, including the translated editions.

RECORD

Things built

Apps and publications, listed by name.

Next

▶ See the achievement card collection