I bought both volumes of Brilliant Blue after reading some reviews about it (here and elsewhere). I was prepared to be, well, unimpressed, but them's the chances you take when you start to cold read a new manga (book, etc). I finished it and then re-read it. And I keep going back to read it. This is one of those stories that really takes time to develop the characters, and this is what makes it so good. At first Shouzo comes across as not really likable 'cuz of his way of saying things straight out. He tells one character that he's always admired him because of his ability with words (other guy is pleased with the complement). Shouzo continues on to say quite seriously that it is the ability to bullsh*t with a smile that is so impressive (other guy is not so pleased to hear this, haha). And whilst Nanami is often thought of as dim-witted, he is really just a dim-wit. (there's a difference). Someone who is dim-witted is someone who is, well, mentally slow. A dim-wit is someone who is scatter-brained. Nanami at first seems dim-witted. But as we find out more about him, he is really just one of those people who are scatter-brained. Namami is very smart when it comes to numbers and he is really good at his job. He just has trouble reading kanji. And he is also prone to saying whatever is on his mind, and can't keep a secret. And he loves to eat!
The families of these two are also depicted very nicely, too. It is such a cliche when the family or extra characters are done in black/white. It is so refreshing to see secondary characters given depth. Both Shouzo and Nanami's are close to their family (and are also annoyed by their family at times).
The turning point in this story happens when Shouzo starts to really see Nanami. Even though Shouzo at times seems like a cold hearted kinda guy, his actions speak differently. He never makes fun of Nanami and often speaks up for him. That's when I first started to like Shouzo and think there was something more to him.
I don't mind 'unrealistic' in fiction. After all, that's why it falls under the 'fiction' category! If I wanted 'real life' I'd go read documentary or non-fiction. It is such a pleasure to come across a sweet story like this. However, what I did find realistic is the way the families interacted. And that was refreshing. Neither family goes the black/white route, where they either hate everything about the main character(s), or love everything about the main character(s). Everyone treated each other with respect (and often disagreed with each other). (yes, this does happen in real life, although unfortunately not often enough).