Where to meet Japanese people in Mainz

I was wondering is there any place you could meet japanese people in Mainz?
I lived in japan for three years and i would like to keep meeting some asians for some chats,
perhaps even to improve my japanese :-)

Hey robertino,

Atashi mo nihon e sunda koto ha aru. Atashi wa nihonjin ja nai kedo nijongo Stammtisch dekitara, kyomi ga aru.

(translation)
I'm not Japanese but I used to live and work there. If you were perhaps considering getting a Japanese Stammtisch together (hint, hint), I'd be interested.

(My Japanese is really rusty.)

Ja ne.