Short Prologue OVA of Kami nomi zo Shiru Sekai

According to Natalie, a short OVA will be bundled with Kami nomi zo Shiru Sekai manga tankobon vol.10. It's called "Flag 0" and a prologue episode of the anime. It will be released on September 17th.

Newly announced cast:
Takahara Ayumi: Taketatsu Ayana
Aoyama Mio: Yuki Aoi

Source: Natalie