this has been my favorite manga for many years now, and I look forward to it greatly.
The only bad thing is this anime will only be a half season so storyline wise it probably won't get past the first volume of the manga. This is the same thing that happened with Aoi Hana (Sweet Blue Flowers) Takako Shimura's other manga that was made into an anime. From my understanding (info from ANN) though the manga of Hourou Musuko has been relesed in North America as of this December. So watch the anime and if you want the rest of the story buy the manga, its been running since 2002 and has 12 volumes already.