The series originally came out in 2013 but has been dormant on the anime front until the OVA was announced.
The series was directed by Masahiro Mukai based on scripts by Shogo Yasukawa and character designs by Hitomi Takechi.
This past week saw Kadokawa bringing out a priced-down release of the Hyperdimension Neptunia TV anime series in Japan on Blu-ray while also showing off the new OVA at Anime Expo.