My biggest hope here is that this story doesn't buy too deeply in 8man's hype. As far as I'm concerned, while he has some really cool moments and I find him interesting, he's still a misanthropic cynic who has a bit of remaining chunnibyou.
Why is Hachiman in class B? It would be correct if he were in D. one for leaving the entrance exam blank and two for his terrible attitude and three for his lack of cooperation.