I like the first prequel with the 2 brothers, Tetsu and Hiro, and with that prequel you kinda can understand the main story, which I didn't really completely fully read, I skipped some boring part the first time that I read it, also without the prequel, I was a little bit confused, now I understand the main story (again I red just the part that I wanted), and also I like the prequel more ahah maybe I am a pervert but I liked the story in the first part of the prequel more, the rest from the second part of the prequel till the end just gnee.
Shiiku Gakari Rika