Nope, Keisuke's route is the "you as a slightly abusive boyfriend with anger issues" route. It's really weird since the protagonist is pretty chill in literally every other case, but I guess that that rabbit hare just hits the right spots ¯\_(ツ)_/¯
Not really, he can't do anything with Shoichi because he's stronger than Yuuichi, but Yuuichi has hit Jun a couple of times, just not as intensely as he did that time with Keisuke