I already saw someone putting this manga in the list of stories that shouldn't exist. I disagree in its totality. If you read this manga and left thinking this is a pedophile story, you didn't understand anything. This is not a story of a child getting in love with her adult teacher, or said adult teacher seducing a child, nor the story that sexualizes children. It's a story of Kokonoe Rin seducing her teacher.
This is the story of a girl, who happens to be a pre-teenager, getting in love and seducing her teacher. Does she tries to use sexual innuendo, or show her body? Yes, she does. Does this sexualize children? No. If you pay attention, you'll notice that Rin is the only child that sexualizes herself, the other children behave like children. Rin is different, she's an anomaly. She matured too fast, maybe because of the traumas, or whatever, but that is an adult woman seducing a man. You notice many times that her maturity doesn't manifest only in the sexual way, but in the responsibility and in the protection of her loved ones, including self-sacrifice. This is brilliantly contrasted with her step-father, who is immature, a boy who didn't grow up. He is selfish simplistic, and incapable of self-reflection. And this is the main theme. What makes someone a child and someone an adult? Is it really just age? In Justice League, Batman says that he isn't a child since 8 years old. Is that really that absurd, when traumas are taken into the equation?
Besides Pedophiles won't like Kokonoe Rin, she may have a body of a child, but doesn't behave like one, she isn't innocent, or easily controllable. A little spoiler here And of course, her pre-pubescent body, isn't really attractive to the teacher either, he doesn't feel attracted by any other child at any point of the story, it's her dominant and sexy character that wins him over. So each time I see someone saying this is a pedophile story, I feel they are losing a great story.
And now you may ask "After reading this manga do I think the laws and conceptions about pedophilia should be rethought?" Not at all. The laws and conceptions are right here. And should be respected even in a case like Rin. You never know how many traumas a relationship with an adult could cause to someone so young, as you never know if you're really dealing with a case like Kokonoe Rin, nor if even in such cases there wouldn't be any traumas. Spoiler [spolier]Which is why I completely agree with the ending the author chose. It's the right way to deal with a case like this. [/spolier]
PS: The ending also gives you a nice question to think over too, showing how brilliant the author of this story is.