Yamamoto Kumoi's 8 page eromanga on Vol.3, the March, 2005 issue of COMIC RIN. A girl, called Eri, is forced to be a sacred prostitute of her father's pseudo-religion. This manga has never been included in any comic book. It's the origin of this meme: 「サンキュー神さま!!」「いいってことよー」 ("Thank you God!!" "Don't mention it.")
