This is the circle of Iwabe Shiu and Asato Orie.
Asato-san is famous for very simple, yet beautiful artworks. In particular, the 'Jenova' dj series was popular for quite a
long time, and Alias Nanigaya has also done doujin for other series, including Rurouni Kenshin, One Piece, Yuu Yuu Hakusho and Gundam Wing.
Some of the books are mild shounen-ai,
or there are weird psychological relationships (like in some of the more violent Jenova books),
but it doesn't seem to go beyond that. This circle has now broken up, so there won't be any new doujinshi from them.