Ahh, sweet bliss. This one has potential... Overall, this is good GOOD start. Vampires don't usually bring out the best in a manga, but that's okay for now. As long as something doesn't go horribly wrong, I can see that this will get popular, and soon.
Art: I'm loving this, as it is extremely hard to find a book that has art that I can stand. So far, similar great art from some others that I've read. On the art side of this, it is a compelling attribute that will draw readers in. Love the cover. Yay for eyecandy!
Plot line: Jumps right into the supernatural, but for me, it was a little abrupt. Until there is a major conflict, this will be a child's game. Perhaps later on, I will change my comment, hopefully complimenting the author's handiwork happily.
Characters: Kana is sweet, but she lacks something... if she had been raised to believe in supernatural beings, it would have been more believable. It's uncomfortable when thinking about the fluidity of her actions, which make it seem like she accepts things easily... perhaps extreme laidback actions can be viewed as acceptable for the future? The werewolves and further creatures should be explained sooner, but it still shows potential. Aki seems to not justify his actions of any sort, making it hard to grasp the whole situation and story.
I can see some humor in this, and the art is a huge key in bringing this up high. The art is high def, but I predict another "damsel in distress" at the most critical times manga. We'll see, but I'm happy as it is.