The art direction is wonderful, the development of the story takes time, but without being overwhelming, these are the points that I don't see in most BLs and that I see in this one, and they are very good :D But...well...The only thing that really missed me was the story itself, when you see such beautiful art, and chapters so well organized, you imagine that the story to come is something profound, complex, or at the very least, interesting. But the story of this manga is somewhat cliché, and even uninteresting (???) The plot of them being brothers is not the main factor in the story, and is treated as if it were something exaggeratedly complex, but well, it is not. The amount of time that the manga spends recycling the plot of them being brothers (and also the plot of the cards), did not show in the end to have as much relevance that the manga developed to have. Furthermore, as I said, the art direction is incredible, but the moments that the art is applied are so superficial, and with such a beautiful art, it seems even forced by the manga to try to put so much drama in something so "ridiculous". I would have liked it better if the story really was anything other than superficial conflicts treated with overestimation, but that's just my opinion, it can even be considered a pleasant way to spend time :V
Haikei, Niisan-sama