Well Kiriya and Karin finally did "it"...But they had some problems before the act if you know aht i mean...but it's no need to tell you more...You can read it from the following site
http://z11.invisionfree.com/The_Evil_Empire
You go to "Last Grave" topic write ten replies and then to "Dark Castle" --> Ongoing manga--> K--> Kare first love and enjoy the scanlations