Kami nomi zo Shiru Sekai: Flag 0
The World God Only Knows: Flag 0, 神のみぞ知るセカイ: Flag 0
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.
