The anime covered until chapter 42 of the manga and the manga now has 84 chapters released. But in June 2009 the series was put on hiatus due to Yazawa being ill (Yazawa is the mangaka).
Yazawa returned from the hospital in the beginning of April 2010 but has not specified when or if she will resume the manga.
Does anybody know anything about it? Will it ever be resumed? If so, when?