Orphans (Anime)

Orphans are children bred for the purpose of being consumed by Demons. These children are kept in farms located in the Demon World under the guise of "orphanages". The children are led to believe that they are orphans waiting for parents to adopt them and that when they are "shipped out" that they are being sent to foster families, when in reality, they are sent to be slaughtered and eaten by demons. The vast majority of orphans never reach adulthood and the few that do are only kept alive for the purpose of breeding and caring for more children. The orphans are all branded with a unique identification marker specific to the farm that they are from.

History
1,000 years ago a proposal —otherwise known as The Promise— was formed by the first head of the Ratri family. It declared that "humans and demons are restricted from further hunting." Afterwards, the world was broken into two — one side belonging to the demons while the other belonging to the humans. As per the agreement, as small number of humans were left behind in the Demon World to satisfy the demons need to eat humans. These human were kept in plantations known as Premium Farms or Factory Farms. While there are hundreds of Factory Farms, which are for mass production of cheap meat for demon civilians, there are currently only four Premium Farms which produce high quality meat for wealthy and high ranking demons.

Trivia

 * When asked who the father of the children is, Shirai refused to answer. Saying "That’s a secret."