Aka Maboroshi no Hana Yoi no Tsuki
This is a partial of the artbook "Illusory Flower, Evening Moon" which contains many illustrations, some from Pet Shop of Horrors and other titles by the same mangaka.
2 groups actually worked on this same artbook. Obsession didn't join the double pages but Night Exile did, so I'm posting both versions. Take note that Night Exile covered only a small portion of the artbook.