Series: Touhou - Touhou Jansoukyou (mizuki hitoshi)

Japanese Title: 東方雀荘郷 (Touhou Mahjong Club)
Mizuki Hitoshi's doujinshi. You can buy it legally at digital distribution sites:

• DLSite.com (525 JPY): http://www.dlsite.com/eng/work/=/product_id/RE052594.html