At the time while I was reading this manga, I thought the story was pretty average in the beginning. It was just like any other story where a love triangle forms, and a couple forms while one guy is left out. And of course, this guy is the despicable one that the main heroine has no intention of falling in love with. But then twists occur and mysteries begin to develop. By the end of the story, it's a surprising ending, but when you think about it, the story couldn't have ended any other way.
Overall, I would read this manga, but I found the heroine of the story extremely annoying. Obviously, she lets men take over her life too much, and doesn't understand the severity of her actions.
Also, in the beginning it may seem like the story is progressing slowly and is way too happy - trust me, something bad will happen soon enough.
Also, I felt like one of the main male heroes was way too focused on sex. He confused sex with being the most important thing in a relationship, and this sends a wrong message out to the audience. I didn't like how the heroine was letting herself be pushed around by the male hero either.