I've been staring at this thread for a while, and NOW I finally remember what the Tsukihime manga was. I read the 4 volumes out, and it's pretty good. The publisher I bought from kept the Japanese and had the English translations next to it. I found this to be very nice, and it was sorta a way to pick up a little Japanese as well. They dropped this approach in volume 2 and after, and only had the English translations. I didn't like it as much after that, but it was still good.
The publishers released a collection of the 4 volumes in a package, but I was pretty sure I saw a 5th volume of the series as well, which got me quite lost. There was also no words of a 5th volume either. Ahh, I'm confused -____-.
["Here is wisdom. Let him that hath understanding count the number of the beast:
for it is the number of a man; and his number is Six hundred threescore and six."]
--Book of Revelation 13:18