aki_sora
あきそら(Aki-Sora) is manga series written by Itosugi Masahiro. It was adapted for a Drama CD and OVAs.
Though this comic is not an adult comic, the theme of it is very immoral.
Characters
* Aoi Sora (protagonist)
* Aoi Aki (Sora's older sister)
* Aoi Nami (Sora's twin sister)
* Sumiya Kana
* Satsuki Runa
See Also
* Wikipedia article: http://en.wikipedia.org/wiki/Aki_Sora