I've only watched the anime (and just Railgun at that, not interested in watching an anime with a harem protagonist), but is that... Misaki? I thought her and Misaka hated each other? It probably isn't, but, well, am I glad to see more yuri in more mainstream works (if it actually is). Poor Kuroko though...
And don't worry about Kuroko, she has Drill-chan now :p
Did they actually introduce a legit love interest for Kuroko or is this just a joke? I think her getting a girlfriend would singlehandedly convince me to read the entire light novel series... yeah, Kuroko and MIsaka would be better, but, well, I'll take what I can get.