I don't have a problem Kuroyukihime liking pig boy. I've seen far worse in harem series, and here it's logical (when love IRL usually isn't). KYH values being the strongest and fastest, and from what looks like it, she was at the top of brain burst but was forced to go into hiding because the rest of the kings banded against her. With her only able to beat pig boy via cheating, I guess she was really impressed at how well he perfomed in that game.
No, what I've got a problem with is them depowering KYH. I know its supposed to be like a shounen show, but a part of me dies whenever a strong female is reduced to this state. Goddamit Japan...
Also, Taku was backdooring Chiyu all this time? I thought they were too young for that, but I guess, kids these days...