I seriously don't understand those people, who likes Risako. Like, why? It makes me sick in a stomach when I see people writing about her in so many superlatives, when she doesn't deserve to be liked. Manipulative, unhonest jerk. When I see characters in other series, that look like her, I immediately can't read / watch it because it reminds me of that one character, that I hate : P Sorry for bad Eng.
I won't blame you for hating her. She certainly has her own problems, but that is what makes her an interesting character to me. Although I think she should have handled things differently, I find her way of thinking understandable. Some people push others away before they have the chance to get rejected romantically or otherwise because they don't want to experience such unpleasant emotions. I also find her understandable regarding her desires to not feel things towards others and distancing herself. She appears out of touch with her emotions and unable to understand others emotions. This might be why she is so interested in Kaoru, because of how expressive she is. She even says herself she wonders how fun life would be if she could life like her. She seems very complex and her mindset and motivations intrigue me so I want to know more. For this reason she is one of my favorite characters in the series.