For inquiries or information

TEL: +81-80-1928-8778

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. (3D rotatable images of SODs)


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

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,

Introduction of Remote power controller (switch, SOD, since 1994)

for SDGs      Only one technology    Available for free testing 

This SOD technology is now available for free testing as Remote power controller as shown in the following figure.   

Introduction of environmentally friendly dyeing & printing for SDGs

Handmade printed original goods only for you

Introduction of 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.    

Introduction of EIKEN Network 

Only one network of this kind in Japan, Volunteer activity


  On April 12

  TV coverage on    

  EIKEN 1st Graders' Network

  Free English learning society


Introduction of overseas business activities

The following pictures show the overseas and its related activities

Introduction of 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)

Coverage by newspapers and magazines (2013~)

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 

               played by the site owner, Karl Kamamoto


L' estro Armonico / SORA,

     a classic guitar group, Karl Kamammoto  

News updates

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
Sept. 09, 2021 KTK English learning site opened
August 16, 2021 Remote power controller (switch, SOD), introduced
August 04, 2021  'STEP 1st Graders' Network in Japan', renewal of data
July 23, 2021 New printing brand MyPrint, preparatory work started
April 12, 2021  'STEP 1st Graders' Network in Japan' introduced on TV
Feb. 18, 2021  SDGs Super Ecology Dyeing Laboratory opened
Jan. 08, 2021   Multi-use rental room opened
Jan. 01, 2021 

 A Happy New Year  with a music of my own playing

November 12, 2020 Newspaper coverage and TV coverage in commemorating of the 40th anniversary of Onomichi Free English Learning Society (Onomichi ESS)
August 27, 2020  Power-saving way of telephones, faxes, etc released on video
August 04, 2020

English learning support at Onomichi Glocal Labo started

June 15, 2020

Japanese - English translation service for personal writings started

June 01, 2020

Eiken 1st Graders (& equiv.) Network, Japan

Registration support for to-be examiners re-started

May 15, 2020 Worldwide English, Japanese Language Exchange Network opened
April 20, 2020 Renewal of tenant office / shop, KEC Building 
 January 13, 2020  Developing story of Electricity Saving Device named SOD (Switch on demand) started being published on STORYS. 
 January 09, 2020  Office / Shop for rent for any nationality, KEC Building
 January 01, 2020  Happy New Year!

   News in the past is listed here.

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