There are two doujinshi title are created by Pro-tec. They are....
1.しゃるろっと (http://doujinshi.mugimugi.org/book/450016/)
2.(http://www.pixiv.net/member_illust.php?mode=medium&illust_id=37696059)
Sorry, I do not know the second title but i am sure it is sold in this year C84.
Thank you.
