讲述冷血保姆三田是一位不孝不漂亮的女人，在亿家失去母亲的家庭开始工作的故事，工作时候自己能够出色完成所有的事情，却总像一个机器人，面无表情，无论什么样的命令或者是犯罪的事情。三田都会冷静的思考，认真执行，使阿须田家中所有的成员和周边的人对三田感到惊讶，三田种种的行为，让原本分崩离析的家庭逐渐产生微妙的变化，最后阿须田家的孩子们请求三田成为他们的母亲，三田竟然答应。惠一从孩子口中知道这件事后，以为自己听错，找到三田再次确认，没想到的是田天拿出结婚证，上面签好名字，盖好章。惠一虽然不想答应婚事，但是为了孩子们以后着想，希望三田能够永远的留在阿须田家，照顾好所有的孩子，成为这个家的大家长

It tells the story of the cold-blooded nanny Sanda, an unfilial and unattractive woman who started working in a family that lost her mother in Yijia. All things, but always like a robot, expressionless, no matter what kind of order or crime. Mita will think calmly and implement it earnestly, so that all the members of the Asuda family and the people around him will be surprised by Mita. Mita's various behaviors will gradually bring about subtle changes in the originally disintegrated family. In the end, the children of the Asuda family request Sanda became their mother, and Sanda agreed. After Huiyi learned about this from the child, he thought he had heard it wrong, so he went to Santian to confirm again. What he didn't expect was that Tiantian took out the marriage certificate, signed his name and stamped it. Although Keiichi didn't want to agree to the marriage, but for the sake of the children in the future, he hoped that Mita could stay in Asuda's house forever, take care of all the children, and become the head of the family