For the Kung fu part I guess the most usual Kung fu is the Shaolin kung fu. I am practicing Kim son Quang Kung fu, but I think my master is the last one with a black belt in Kim son Quang, since it was his own family that invented the Kim son quang.
I don't know how this works in japan, but do you think that a Karate dojo for instance will be willing to have me to join their dojo for one year?
I'm wondering if I'm going to try out boxing again, when I come to japan, do you know of any boxing gyms in Tokyo, if possible close to Shibuya (Futako Tamagawa.) ?