故事发生在名为恩典农场的孤儿院内,在这里生活着很多失去了亲人,无家可归的孩子们,他们共有36人,每天,在劳作和玩耍之余,孩子们还要进行学习和测验,其中,佼佼者是名为艾玛(诸星堇 配音)的女孩和名为诺曼(内田真礼 配音)的男孩。负责管理和看护这些孩子们的女性名叫伊莎贝拉(甲斐田裕子 配音),孩子们喜欢喊她“妈妈”。每过一段时间,都会有一个孩子被收养离开农场,生活在这里的孩子们都将此作为自己的人生目标。 一次偶然中,艾玛发现了隐藏在这座孤儿院背后的秘密,那些离开的孩子根本就没有被领养,而是被屠宰了,生活在恩典农场的孩子们,其实就是这座农场所饲养的“牲畜”。At Grace Field House, life couldn't be better for the orphans. Though they have no parents, together with the other kids and a kind "Mama" who cares for them, they form one big, happy family. No child is ever overlooked, especially since they are all adopted by the age of 12. Their daily lives involve rigorous tests, but afterwards, they are allowed to play outside. There is only one rule they must obey: do not leave the orphanage. But one day, two top-scoring orphans, Emma and Norman, venture past the gate and unearth the harrowing secret behind their entire existence. Utilizing their quick-wittedness, the children must work together to somehow change their predetermined fate.