According to CDJapan, follow by the announcement of release date for ending theme "Aoi no Syndrome", opening theme "Dive" by Amatsuki will release on December 14th.
Preorder avaiable here, anime edition comes with exclusive CDJapan bonus.
Just like the ending theme, the CD comes with different versions, some includes DVD.
If you are interested to order them, you can order them on the left column of this page.
This month's Animedia magazine features Eri and Dokamon, the official twitter also mentioned that Eri will make her debut on episode 5.
