Look, it's rare that I'll say this, but seriously: What the fuck.
I mean, I expected some weirdness, but this is somehow so much worse - and yet, I was compelled to read to the end. Leave your moral values at the door, before reading this manga.. and then lower then through every subsequent chapter. Er, basically, there's a lot of questioning what exactly the relationship between adult brothers are, but the child of the older brother rapes the younger brother into a facsimile of a relationship - which works because the younger brother has some seriously unresolved issues about family, abandonment and intimacy.
Maybe because the father/eldest brother's character was not mentioned as often, he managed to get away with ironically deeper and more compelling characterization... or it's just that the other two really have bad enough personalities. Seriously, the dad is genuinely a character I want to learn more about and, what's worst, treats the poor younger one with more respect and delicate touch in their one almost-sex-scene.
One thing's for sure...this manga will stay in my mind for years, haunting my subconsciousness