For inquiries or information

TEL: +81-80-1928-8778


Sales pitches and/or use without reply information strictly prohibited.)

Business hours

9:00 ~ 17:00 (Monday ~ Friday)


Technical/company introduction,

guitar performance program


Book publication

(technical development, English learning)


TV program, book publication,

guitar performance

In Kampala, Uganda in September, 2008
In Kampala, Uganda in September, 2008 as a member of Investment Promotion & Observation Team both by Japanese Government and Private sectors

Office KTK was established in Onomichi-city, Hiroshima in Japan in 1977 as a translator's and interpreter's office for SMEs. Since then we have served for many companies, groups and individuals with its business policies of contribution to internationalization, natural environment and local communities.


KEC Inc., the predecessor of Office KTK, has been an electronic and chemical technology development company and it worked on developing the electricity saving technologies and the devices (named SOD) between 1994 and 2012. It won Energy Conservation Award in 1997 as the smallest company ever, and the technology has been transferred to NTT-AT


The SOD also has received two other prominent awards, making us a triple awards winner

This SOD technology has now been applied to Internet SOD as IoT (Internet of Things) as well. (Introductory video at the exhibition 

Notice: The homepage site of KEC Inc. ( and its E mail address were closed on December 31, 2013.


What is SOD?  Watch, listen and check it at the following sites, please.

TV introduction on NHK

in Japanese

Radio introduction in Gifu

in Japanese

Introduction by KTK

in English

Example of overseas introduction (booklet of the German Federal Environment Agency)

Serial Introduction of SOD development on Internet books 

Books  Title of books  Languages used
① STORYS  Wow! Here comes Setsuden-mushi!  English
② note

 Trajectory of Energy Conservation Grand

  Prize-winning Technology Development 

 Japanese and English

The expression "Sustainable Development Goals" (SDGs) has been often used these days, but our office, OFFICE KTK, was already working on SDGs in 1994 with the development of energy-saving technology.

SOD was calculated its environmental impact using the life cycle assessment method and also evaluated for its environmental impact reduction effects by itself, which led to Type III EcoLeaf environmental label certification as the 3rd one in Japan,


Automatic Electricity Saving (Power off) Outlet

 Only one technology since 1994        SDGs  Free testing available

This technology achieves zero standby power, which cannot be overcome by digital technology.

Please use this technology to develop new products and/or services and to improve existing products and/or services. 

For more information, please click here.

Remote Power Controller (switch, SOD)

   Only one technology since 1994        SDGs  Free testing available

This SOD technology is now available for free testing as Remote power controller.   

Private English lesson on line

 "Online English learning support" and Tour Guide for non-Japanese are available at Office KTK as the language related business.    

EIKEN 1st Graders' Network in Japan 

Only one network of this kind in Japan, Volunteer activity


  On April 12

  TV coverage on    

  EIKEN 1st Graders' Network

  Free English learning society


Overseas business activities

The following pictures show the overseas and its related activities

Other business fields and activities

This website also has a blog pagehobby pagesregional volunteer activity pages as well as TV and radio program production recorded pages.                         


Notice: The homepage site of KEC Inc. ( and its E mail address were closed on December 31, 2013.

STEP 1st Graders Network

Volunteer activity

Free English Learning Society

Volunteer activity

Classic guitar playing 

Hobby activity

Introduction of media coverages

Introduction of KTK & Technologies by medias

Introduction by TVs 

Coverage by newspapers and magazines (~2012)


Introduction by videos 

KTK Homepage 

Career history (Karl Kamamoto)

Hobby introduction (Karl Kamamoto) 

Volunteer & Hobby (Karl Kamamoto)

More pictures are here.

Introduction of music activities

Please listen to those while surfing our home pages.

Music Space 2010an original guitar music for us,

               compsed by A. Kitagawa, a guitarist


La Playa      Barcarole      Feste Lariane

Recuerdos de la Alhambra   Amazing Grace

Lagrima   II Ferroviere    Dream of Love No. 3

Song of Life (with piano accompaniment)

Feste Lariane 2021    Sake yo     Solamente Una Ves

               played by the site owner, Karl Kamamoto


L' estro Armonico / SORA,

     a classic guitar group, Karl Kamammoto  

News updates

May o7, 2024 New career history of Karl T. Kamamoto 
April 20, 2024 Himawari Music Festival finished its activity since 2012.
April 07, 2024 Newspaper coverage of Eiken 1st graders' Network in Japan
Feb. 20, 2024 New homepage for Japanese products overseas
Jan. 27, 2024 Visting Guitar Performance 2024 - 1
Jan. 1, 2024 A Happy New Year 
Dec. 18, 2023

Two Classical Guitar Solo Performances uploaded YouTube.

Oct. 17, 2023

Introduced by the Onomichi Simanami Shinbun (in Japanese). 

May 17, 2023 Announcement of Automatic Electricity Saving (Power off) Outlet Technology,  Introduction Video Released
April 25, 2023 Work History by Age newly made.
April 01, 2023 Business card with 4 QR codes newly made.
Jan. 28, 2023 Sake yo, the 1st guitar solo in 2023 uploaded on Youtube
Jan. 10, 2023 Private English Conversation Online Lessons for 4 students, April 2023 
Jan. 10, 2023 Start a new series of posting on Face Book, "Writings with idle ramblings" in Japanese and English every other Tuesday
Jan. 01, 2023  A Happy New Year 
Sept. 20, 2022  Onomichi Information, a new page added
Sept. 10, 2022  Memory of  English conversation instructor on NHK, a new page added
July 27, 2022  Started serial posting to note, Guitar playing as a hobby
July 22, 2022

 Started serial posting of TV shows to note,

     Once upon a time in Onomichi and Neighboring on the Internet

July 12, 2022

 Started serial posting to note

      Trajectory of Energy Conservation Grand Prize-winning

      Technology Development

April 16, 2022  Music performing at local gatherings for mutual help
March 01, 2022  All rooms of KEC Bldg. occupied 
Feb. 01, 2022  More than 100 Eiken 1st graders registered
Jan 01, 2022   A Happy New Year

   News in the past is listed here.

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