The official site of this series by Konno Azure posted yesterday a new 92- second promotional trailer for its upcoming OVA that can be seen here.It is the story of Aoyagi Kanna, a 16 year-old girl who was asked to become a seiyuu (voice actress) for eroge (adult videogames) by her 28 year-old sister at her adult entertainment company. She refused at first but she finally decided to do it given all the things her sister did for her. Thus the trouble ensues in hiding it from her teachers and friends O_o.
The manga started being published in 2008 in Comic Gum magazine by Wani Books and this anime adaptation will premiere on November 2010.
Update: there are actually two promos.