Oh it's not related at all, Shingo just happens to be there when was having a stroll but he then make trouble along the way. He was only there for one or three scenes i think. As you can see here
http://comic.xxbh.net/201212/238107.html?page=72
http://comic.xxbh.net/201212/238107.html?page=74
cool thanks I was wondering. Hope they update both stories as I am dying from smexy were cat withdrawal.
can anyone tells me how this relates to Kuroneko Kareshi no Asobikata besides them being were-cats.