I worked as the head coach of Seiritsu Gakuen's Middle School & High School's famous karate club, then oldest in Tokyo, from 2004-2014.
Not to mention I was lucky to teach the kids at the kindergarten the school owned across the street.
During the mornings I was the international department manager coordinating foreign students coming to the school and Japanese students going abroad.
Of course, karate was the main role, and in ten years we easily attended 100 karate events!
Seiritsu (Jpn homepage) 成立学園中学・高等学校
Seiritsu international department English homepage