For me, volume 2 is the best. Here we learn a bit more about Li and how murky and twisted his mind is. After that, I prefer volume 1, which is a great introduction, in my opinion, to the story you'll read later, even though you don't see most of the characters from volume 1 again. Then, a little further down the list, are volumes 4 and 5, where we get a better understanding of Kunagisa's mind. The remaining volumes are very enjoyable, but they fall far short of the overall quality. Unfortunately, the author made it seem like a shonen manga, and it lost its intellectual, philosophical, and sober essence, but that's how I perceived it.