The Kagoshima 2600 hacker/security group
No requirements to attend! Japanese or foreign!
Meetup on the first Friday of every month, at the place described in the magazine. Meetings will begin at 5pm or a bit later depending on lateness :P

Amu Plaza next to the central railway station in the basement food court (Food Cube) near Doutor Coffee.
Amu Plaza page(flash required to view map) http://www.amu-kagoshima.com/

2600 magazine page:
http://www.2600.com/