The book series
Uchi no 3shimai (うちの3姉妹) by
Matsumoto Pretz will be getting animated.
There are currently 5 books released of this series, and the 6th will be released in February 2008.
Covers:
Broadcast: April 2008
The
Uchi no 3shimai book series is based on this blog:
Uchi no 3shimai～manga de miru kyou no dekigoto～
According to
this site, the blog is one of Japan's top 50 blogs.
Source:
http://ameblo.jp/3shimai/entry-10068827266.html