The official website
for the upcoming OVA sequel Nogizaka Haruka no Himitsu: Finale
has just revealed the release dates for the OVA's four planned episodes. The first Blu-ray and DVD volume will be out in Japan on August 29, and the others will follow on a monthly basis - on September 26, October 31 and November 28, respectively.
Like the first two TV anime series that aired in 2008
, this third anime adaptation is also based on Yusaku Igarashi's school / comedy / romance light novel series also known as Haruka Nogizaka's Secret. The original story focused on a respected high school girl who is actually an obsessive anime otaku - something known only by her dear friend Yuuto.
The upcoming OVA has been conflictingly reported to cover either the story leading up to the original light novels' final arc, or the final arc itself. Believe whichever you please...