Review referred to the series (3 volumes, not the one-shot). I give it a 7 just because the first 2 volumes, of the 3, are really good in my opinion. The art-style is really good too. So, as I already stated, the first 2 volumes are great, with the 3rd one though there's a big downfall. Japanese authors tend to exaggerate, to overdo with things. Most of the times what you need to do, to make a good story, is to be as minimalistic as possible (because the more the details the harder to link them all together) and if this one was the case the mangawould have been really good overall instead of being 2/3 good and that last 1/3 bad (really bad and no I'm not talking about the ending). I'm not going to spoil anything but let's just say that I like stories that follow a logical straight line from beginning to the end.