本集介绍： 濑川祐太（羽多野渉 配音）自幼失去父母，由姐姐祐理（大原沙耶香 配音）一手抚养长大，因此，祐太和姐姐有着异常深厚的感情。令祐太没有想到的是，姐姐居然嫁给了一个有着两个女儿的年长男人小鸟游信吾（飞田展男 配音）并且为他生下了第三个女儿。
明知无法一生都和姐姐在一起，但祐太却仍然抑制不住内心的沮丧，虽然逐渐减少了和姐姐的联系，但姐姐的一举一动还是被祐太看在眼里。所以当小鸟游夫妇在飞机上不幸遇难的消息传来后，祐太毫不犹豫的收养了小鸟游家的三个可怜的女孩。个性害羞又很傲娇的小鸟游空（上坂堇 配音）；年龄虽小，但异常成熟懂事的小鸟游美羽（喜多村英梨 配音）；惧怕生人但格外信任祐太的小鸟游雏（五十岚裕美 配音）。大家都是曾经失去了父母的孩子，这四人能否组建一个幸福的家庭呢？
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