Their website no longer works. I found this contact info on the aikikai website.
道場名 沖縄合気会名桜大学合気道部 先生の名前 山口巌
所在地 沖縄県名護市字為又1220-1
連絡先 098(857)1170
備考 名桜大学柔道場
月・木曜日19:00～21:00
お問い合わせqqv278gb9@fork.ocn.ne.jp
ＨＰ
http://www3.ocn.ne.jp/~okiaiki/
Obviously it is an aikikai dojo, but I have no idea what lineage the sensei is. His name is Iwao Yamaguchi, and there is a previous thread asking about his lineage here:
http://www.aikiweb.com/forums/showthread.php?t=5262