Shokuzai no Kyoushitsu ~The Seven Stories of Sin~

The main character Nanaze has a father who killed someone. Nanaze thinks it is partly her fault (unknown reason) and uses her body to pay for her father's sins. Later on in the story the complicated family relations between Nanaze, her boyfriend, her enemies etc. are revealed. [From [url=http://www.densetsu.com/display.php?id=438&style=alphabetical]animedensetsu[/url]]