Muraki Kazutaka first learned about Tsuzuki Asato through his grandfather’s notes, and thus became obsessed with Tsuziki’s body, both carnally and scientifically. Although a lot about Muraki has remained a mystery, he referred to himself as a Descendant of Darkness like Tsuzuki in the final episode of the anime.
Kidzuki Sakura (姫月さくら) and Mitsugu (ミツグ) definitely make a lovely pair, especially for this particular series. Please do visit Sakura’s Profile for more of their work. Thanks again to Hachimitsu for sending this in!
Source: 姫月さくら on Cosplayers Archive