My name's Ivan.
I'm one of a group of 40K players that meet once a month or so in central Tokyo. We're always looking for new players so if you're feeling lonely, drop me a line.
We play at either the JIGG venue or one of the many Kuminkaikans in Chiyoda-ku.
Within the group are Warhammer Fantasy players always willing to expand their group, as well as guys living in Chiba, West Tokyo, or Kanagawa (who would prefer a few games closer to home every now and then).
As to the actual play style - we're as informal as you can get.
Next session is likely to be April 29th or 30th (or both). Let me know if you're interested in joining in the fray.