SPOILERS AHEAD:
Story 6/10 - It all starts like your typical vampire type of story and at the start it does everything you would expect from it. First couple of volumes really feel cohesive but then there's the time skip part... yeah... It pretty much ruined it for me since. Later on it changes to some weird cult/secret organization type of stuff and feels VERY RUSHED last couple of volumes.
Art 10/10 - The art is just wonderful. Details are really on point . I really enjoyed the drawings of motion since they were really clear. You can also see some inspiration from Van Gogh when it comes to the sky drawing - that's great. Oshimi Shuuzou also does an interesting job of combining ecchi with blood and all of that stuff. It's not a common theme and he pulled it off just great.
Characters 7/10 - Characters didn't feel too shallow and almost all of them had a somewhat developed backstory which I did enjoy. The thing that was weird for me was asking myself who the actual main character is. At first it seemed like it was Okazaki but then it weirdly changed to Gosho. I don't think it was something specifically bad, but it was certainly confusing.
Enjoyment 7/10 - I really enjoyed the first couple of volumes but after the time-skip stuff I was nahhhh. Eventually I went over it and it was pretty much okay, but pretty confusing in some moments.
Overall 7/10 - It's an interesting manga with great artstyle. The story though... well, it's just weird but I guess it may be to some people's likings.