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They are residents at the Grace Field House, an orphanage that actually treats the children well: keeping them well-fed, clothed, giving them an education, and allowing them play-time. Their caretaker, who they refer to as "Mama," is Isabella, the only adult in their lives. The only rule that is enforced is that the children are not allowed past the fence, dictating the orphanage's grounds. The children are all adopted out by the time they turn 12-years-old, no older, and thus life goes on. But... considering that this is a shounen manga, not everything is as it seems...

