I wondered that to but I could still probably bring myself to like it
http://www.mangago.zone/read-manga/m_nano_baka_nano_hentai_nano/mh/c001/14/
Yep. Pretty much answers your questions.
Does it? How? Are you trying to say that his resentment turned to love because he missed the bully when he wasn't around anymore? I'm sorry, but this still doesn't make sense to me.
I didn't even pay too much attention to the plot holes because I couldn't get past how unlikable and unrealistic the characters were from the start. I kept hoping it would improve, but it was more like 5 chapters of a first chapter or one shot.
Well, I think it's good that this manga is different, plot wise. But I can't bring myself to like it? There are too many plot holes for me, like what happened to Hidaka after the bullying, before he transferred? Is he really okay? How did trauma become love? Is he really in love? There's a lot of things I don't get.