i would never understand why others hate this. I'm also not into incest and almost dropped this but reading far more, I understood why it happened. they had no one but each other to rely on. they were kids and of course, what do you expect? their reasoning is justifiable and the only problem is their morals. the story really shows that there would always be an inevitable moment in your life where other people would never understand.
some doesn't like this story because it's against their beliefs. even I thought that it was disgusting. so, give it a try and try to understand them
Ai to Makoto (Moriyo)