Ok, It has been a while >.< and another anime got announced:
Its based on a manga thats serialized in the seinen(young men's) manga magazine Young Animal
For now there are 4 volumes released of this manga, and volume 5 will be released on 28/2/2006 (I'll add its cover to this post once its out), here are the covers:
On a certain Christmas day, college student Haruma received a "little sister" as present from Miss Santa (verbatim). Haruma, who knew nothing about the girl, gave her the name "Choko." Just like a dream, a new life began for both of them.
Genre: Seinen, Comedy, Romance
Author: ZAPPA Go
Artist: TAKEUCHI Sakura
As of now the manga is not licensed: Manganews