I'm almost tempted to say that the backstory won't be retarded just to be contrarian, but it is true that it's hard to justify edgy loner phase without sounding like a retard. Then I remember just how heart-wrenching some of the backstories of Mahoraba were, so who knows? I think that it's more likely to be unjustified than not, but I'm willing to give the mangaka a chance to try to convince me otherwise.