Kami nomi zo Shiru Sekai: Flag 0
English title: The World God Only Knows: Flag 0
Japanese title: 神のみぞ知るセカイ: Flag 0
Alternative titles: Kaminomi: Flag 0
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Sep 17, 2010
Duration: 1 min
Rating: PG-13 - Teens 13 or older
Studios: Manglobe
Licensors: Sentai Filmworks
Genres: Comedy, Supernatural
Demographics: Shounen

Short prologue OVA, bundled with manga volume vol.10.

Elsie receives from Dokurou Skull, hell's branch chief of "counter measures", the task to go on earth and capture evil spirits that have escaped from hell.