Japan/General Otaku Culture 4chan imageboard.
/jp/ is the Japanese culture board, created by moot around 2008/02/29 during /a/day. The userbase consisted mostly of former /a/ssholes at first, but has gradually drawn members from other parts of the 4chan interested in Japan and its related subjects.
/jp/ posters usually refer to themselves as /jp/edos.
/jp/ Theme Song
Vocaloid - /jp/ Theme Song is a music video representing /jp/edos: