In my opinion, the story basically qualifies as a masterpiece. My only critic would be that, even though the story had many great characters, Aka struggled to finish the story arc of many of them in the end, leaving some with a lacking development (justifying my score). Otherwise, the manga is a marvelous coming of age type story that uses its many characters and humor to explore the many different sides and challenges of adolescence, self-improvement and maturity.
It is definitely one, if not my favorite, manga and, even though I am kind of anxious about A1 choosing to announce a movie, I hope the anime keeps on gracefully adapting Aka's hardwork.

I think it is a decent introduction to Melty Blood's story as well as a good base to play the game.

Man, do I dislike every single character in this. People nag about Kaneki a lot, but the Kaneki in this oneshot is the most insufferable I have ever seen to this day. (considering that I watched the two seasons of the original anime).
However, I do see the point as to how the author was able to sell this as a concept. The only part that I actually found interesting, even if it's hyperbolical, is when Shinohara is putting Kaneki against the wall (figuratively) and he does not know what to do to keep his identity a secret. That part is strong enough to make me think it was the main aspect for the author to have his idea approved.