
仙人けんじって、だれ?

Tsumagoi Work&Campを営んでいます。 He built almost all the furniture here himself.

本名はKenji Sakuramoto。Kensaurus LLCの代表として、アプリをつくっています。

Through his 20s and 30s he worked in IT consulting, cyber security and app development, and he lived in Singapore for more than 20 years.

In his mid-30s he wanted something completely different: renovating a building, a mountain winter, hospitality and events. All of it was new.

The renovation and equipment cost about ¥19.5 million; with the rent and utilities before opening, a little over ¥23 million. It was paid for by kensaurus's IT work and by money he lent the company from his own savings and salary.

Friends and colleagues helped with the renovation.

People told him it was a waste of money. He is enjoying it anyway.

With no mains water or sewer up here, he is learning the septic tank, grass cutting, insects and the rubbish one at a time.

kensaurus takes on consulting, development and photography. This mountain is where he tries all of it first.
KENSAURUSがつくっているもの
A small company that hands Japan's little hassles to AI, so you don't have to deal with them.
Kensaurus LLC · Shibuya, Tokyo · founded June 2025

展示 01
Solo Boss一人社長
Bookkeeping through to tax filing, for one-person companies
Year-end statements, tax schedules and e-Tax / eLTAX files, with a review link for your tax accountant
Free for now
Solo Bossを開く
展示 02
Mushi Mushi虫虫
A report-a-bug button for apps, with AI that sorts the reports
Users write one line; the screenshot, page and technical details are attached for them
Open source · free hosted plan
Mushi Mushiを開く
展示 03
kenji skillsエージェント用スキル集
Step-by-step playbooks that keep AI coding assistants on track
Ask in plain words, like “fix this bug and ship it”, and the matching playbook runs
Free · open source
kenji skillsを開く
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yen-yen · 家計簿A shared household money book, no bank loginiPhone · Android
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the wanting mind · 渇望する心A book about why we want, free to read onlineFree · web · iPhone · Android
Skin Analysis · 肌診断Skin scores and care tips from one selfieFree · no account
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このサイトも、そのひとつ
Tsumagoi Work&Camp — A mountain campsite with an office, run by us
We renovated the buildings ourselves, built most of the furniture on site, and opened in August 2026. The website, online booking, payments and on-site sensors are all software we wrote.
Tokyo Shimbun(2026-11-06)で紹介されました(新しいタブで開きます)無料の会員登録で読めます
予約する
Hermits live on mist. I also make apps. — Sennin Kenji