What can be said about this manga that others haven't? I am not sure, so I will say it anyway.
It is basically what happens when a boy becomes so obsessed with a girl his life spirals out of control and he throws away everything he believes in or has worked for just to try and make her happy. The girl, is a sociopath who shows no emotion except joy when others are in emotional pain and has no qualms about leading the boy down a path of self-destruction because she simply doesn't care about the world or anyone (herself included) in it.

Some might say the story is predictable and unoriginal, both of which I disagree with. It is original in that it takes the usual school romance and twists it until it is so distorted that you can barely see the resemblance to what it once was. Although it starts off much like your generic romance manga, it quickly becomes evident that you will be going for a ride that will keep you on the edge of your seat and keep reading. As for predictability, it is not in the least. Just when you think one of the struggles between the main characters has come to an end, the roller-coaster (if you will) dips right back down so fast you will never see it coming. The characters are also quite different than ordinary manga. While on the surface they appear normal and average, they have multiple levels of emotion, ideas about life and love, what it is to be human, and even self-consciousness. It will not be until the end that you can truly understand the depth of their soul and just how deceiving the initial appearance can be. Art is about average.