Emma lives in an orphanage called Grace Field House along with other children. Two of them are Norman and Ray who, with Emma, are the oldest. The three always reach the highest scores on daily tests they need to take. All children are prohibited from leaving for the outside world. One day an orphan named Conny is adopted but forgets her stuffed rabbit. Consequently, the trio tries to find her to return her rabbit, until they discover that she is dead and the orphanage is a farm that produces high quality human meat for demons. After further discoveries the three brothers continue to use their intelligence trying to fight for their lives and the lives of all their adopted brothers.
