Just got wind of a new bookshop / publishing company having an opening on Friday the 25th in the Shibuya Kamiyacho neighborhood. Kamiyacho is basically the ultra-posh area behind Bunkamura. Here's a PDF with map and information. Sorry, no English version. Easy enough to find though: Go up past Bunkamura to the right and keep walking straight. The shop will be on the left about six or seven minutes past Bunkamura. Party from 18:00 - 22:00. I have plans from 19:00 so I'll be there from the opening for about a half and hour.

They also have a website here.