ja contact

00premed inc. / kaizen group headquarters / tokyo

Making medical facilities
a better, more positive place.

Not only clinics, but hospitals too.

What the front desk checks by eye. What staff copy from one system into another. What patients are asked again and again.
We take the time to turn this work into systems, so staff have more time to welcome the patient in front of them.
PreMed is the headquarters of KAIZEN Group, a group of medical facilities in Tokyo.

fig.0 every commit to our software, one dot each — since 2026.03.20One dot per commit to our operations software, stacked by day (automated commits excluded)

01key figures

1 → 5 clinics,
2024.01 — 2027.05.

The group started with one clinic in January 2024 and plans to have five by May 2027. As headquarters, we support a group that provides 7,000+ consultations a month, in person and online — and we build the software used on its clinic floors ourselves, improving it every day.

changes to our software

6,500+

Changes merged into our operations software since 2026.03.20

patients / month

7,000+

Consultations in one month across three in-person clinics and online (2026.07)

clinics · floors

4clinics
5floors

5 floors across 4 clinics (Ladies Clinic Naminami spans two floors, the 1st and 12th; this includes a pediatric clinic scheduled to open in November 2026), plus 2 online consultation platforms

m&a since 2025.01

2

Medical corporation successions (M&A). In December 2025, the group took over a medical corporation running two clinics, in Shinagawa and Hatanodai

fig.1 latest mergesMost recent changes merged (number, date, type)

~/clinic-os (main) $ git log --merges -n 40

  1. #12610docs2026-10-03merged into main
  2. #12609feat2026-10-03merged into main
  3. #12607fix2026-10-03merged into main
  4. #12606docs2026-10-03merged into main
  5. #12604chore2026-10-03merged into main
  6. #12602docs2026-10-03merged into main
  7. #12601feat2026-10-03merged into main
  8. #12600fix2026-10-03merged into main
  9. #12595docs2026-10-03merged into main
  10. #12593fix2026-10-03merged into main
  11. #12591chore2026-10-03merged into main
  12. #12589feat2026-10-03merged into main
  13. #12588chore2026-10-03merged into main
  14. #12587docs2026-10-03merged into main
  15. #12583feat2026-10-03merged into main
  16. #12581feat2026-10-03merged into main
  17. #12577feat2026-10-03merged into main
  18. #12575feat2026-10-03merged into main
  19. #12574feat2026-10-03merged into main
  20. #12573feat2026-10-03merged into main
  21. #12571feat2026-10-03merged into main
  22. #12568feat2026-10-03merged into main
  23. #12567feat2026-10-03merged into main
  24. #12565feat2026-10-03merged into main
  25. #12564feat2026-10-03merged into main
  26. #12561fix2026-10-03merged into main
  27. #12560feat2026-10-03merged into main
  28. #12556feat2026-10-03merged into main
  29. #12555feat2026-10-03merged into main
  30. #12554feat2026-10-03merged into main
  31. #12553chore2026-10-03merged into main
  32. #12550docs2026-10-03merged into main
  33. #12546fix2026-10-03merged into main
  34. #12543docs2026-10-03merged into main
  35. #12542fix2026-10-03merged into main
  36. #12541feat2026-10-03merged into main
  37. #12539fix2026-10-03merged into main
  38. #12537feat2026-10-03merged into main
  39. #12536chore2026-10-03merged into main
  40. #12534docs2026-10-03merged into main

technology — how we build

02clinic os

an operating system
for clinics.

Turning medical facilities into an operating system. We bring the headquarters' operating know-how and the systems for reservations, intake questionnaires and patient communication together into one OS, so clinics that join through succession and newly opened clinics alike run on the same OS. The more clinics there are, the better the OS becomes. Following clinic os, we are developing hospital os for hospitals.

clinic-os — uname -a: clinic-os 2026.10.03 premed-hq kaizen-group

  1. 0x06userspatients · staffPatients and staff
  2. 0x05apps4 clinics · 5 floors + 2 online platformsGroup clinics and online consultations (run by medical corporations)
  3. 0x04servicesgalapagos — line reservations · ai first response · ai agents · reminders · acquisition trackingReservations, intake questionnaires, patient communication, acquisition tracking
  4. 0x03driversbilling system · emr · lineIntegration with the billing system, EMR and LINE
  5. 0x02kernelplaybook — planning · marketing · recruiting · procurement · legal · claims reviewHeadquarters know-how (planning, patient acquisition, recruiting, procurement, legal, claims review)
  6. 0x01hardwarefloors · facilities — erb · studio kajiClinic spaces, and facilities that add value
  7. 0x00bootnew clinics · m&aNew clinics and clinics joining through succession both boot on this OS

03index

the headquarters,
in eight pages.

  1. 01aboutPhilosophy, vision, mission, values and the work of the headquarters→
  2. 02businessOperations support, in-house software, new clinics and M&A, value-adding facilities, medical equipment→
  3. 03technologyMeasured figures, and how we build→
  4. 04groupKAIZEN Group clinics→
  5. 05careersEvery employee is an FDE: planning, business development, software development (Japanese)→
  6. 06investorsGrowth path, M&A track record, how the headquarters model works→
  7. 07newsAnnouncements (Japanese)→
  8. 08companyCorporate profile and history→

04field notes

written by ai,
every morning.

Every morning, AI reads primary sources, such as those from the Ministry of Health, Labour and Welfare, and writes short notes — in Japanese — on what matters for running medical facilities. Nothing is added that the sources do not say.

field notes — all notes, and how they are written (Japanese)

05news

News

  • We have relaunched our corporate website.

  • Jonan Ladies Clinic Hatanodai has been renovated.

  • The yoga and Pilates studio Studio KAJi opened in Meguro.

news — all announcements (Japanese)

contact

Contact

For inquiries about our software, partnerships or press, please get in touch.

Contact usCareers (Japanese)For investors