この場所をつくった人

仙人けんじと KENSAURUS

標高1,444mの山で24時間ラウンジを営みながら、こたつでアプリをつくっている仙人です。

KENSAURUSのサイトへ

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

  1. Solo Bossの画面

    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
  2. Mushi Mushiの画面

    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
  3. kenji skillsの画面

    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

ほかにも

すべての作品をkensaur.usで見る

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.

この場所の仕組みと、仕事のご相談

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
Sennin Kenji waving hello

Hermits live on mist. I also make apps. — Sennin Kenji