According to a Crunchyroll news article there is a CD franchise. However, the manga and the anime are both most likely "fan service" and/or promo releases related to the new video game coming out on 10/24/13. More of an advertisement than a genuine anime release? So, at least when this is written, it doesn't look like the anime will offer much content.
If you want info on the plot line, etc. go here: http://diabolik-lovers.wikia.com/wiki/Diabolik_Lovers_Wiki
Read through the character descriptions, especially Ayato. I guess this is a super spoiler, but at least there's information that will enable viewers to make sense out of the anime.