I might be wrong, but I don't think that some of the comments being posted here are targeting the manga, but those who are posting things like "She deserves it". Bullying is bad, but in most of civilized countries, you don't rape people as a form of justice. Although, when you've suffered, it might be hard for you to understand that. And that might be why we don't let people do themselves their own justice. Just sayin'.
@yasyas :
"the heroine isn't any better than the annoying rival." True. It's just a sad story, full of sad people and with a sad end.