@Polo
It's the same title Kodansha USA went for their English release of this series. It's a dumb choice to change it here on this site as well and it sounds lame as fuck in my humble opinion.
Dunno if any other series titles got updated with the ones English publishers use.
I just get the feeling that the teacher is just picking on them intentionally. I mean, it's obvious that they're flirting when the teacher ask Shikimori to read.
@ngotaku BOOKWALKER is just an online store; just like Amazon or Steam. I don't think it can change or choose the name of book they are selling, IMO. As somebody already said, the official English name was chosen by Kodansha USA.