Go! Baajinaru Hanayuki

After Kitasanjo Tomoe's family dies in an accident, she learns about the enormous debts her father took for the sake of the family. Now, in order to repay those, she is to be sold as a prostitute. Her classmate Koga however, second-in-command of a big brothrel, saves her by buying her. But his powers are not sufficient to save her from having to do her job...