This is a very hard manga to rate. The drawings are rather sloppy, but still seem to get the job done.
The story is really strange, and starts off with two underage sisters being raped, while their alcoholic mother watches. Soon, their father returns from a 5 year business trip, and a lot of crazy shit happens... and this is only from the first few chapters.
I think my main problem with the story is how blatant immorality isn't punished. Now, I don't mean the sex and violence. That's just fun stuff. It's the fact that the father does everything in his power to help and support his family, even though he does it in a rather extreme manner, yet his family keeps treating him like dirt. Particularly the main protagonist, a thirteen year old slut who ends up willingly having sex with her sister's rapist. Basically, the one guy who does everything in his power to keep his family together, and who's the only one with a spine, always gets the short end of the stick, while the cold, uncaring or evil characters always get away with their behaviour.
The reason I'm giving this a 5 is simply because it's extremely hard to give a good rating to a manga that leaves you depressed and unfullfilled, and wanting to beat the living daylights out of the main female protagonist.
For some reason, rewarding immorality seems to be a trend in most manga trying to portray a semi-realistic view at Japanese high school or family life. For once, I wish someone would make a manga where the protagonist actually had a spine and a sense of justice.