生日没有任何人祝福，这样过着寂寞生活的大学生次郎（小出惠介饰）在20岁生日那天突然遇到了生命中的那个“她”（绫瀨遥饰）。二人共渡了一个美好的夜晚。是夜，“她”从次郎的眼前消失了。一年后的生日，本以为还将回归寂寞生活的次郎再次遇到了“她”。这一次，“她”讲出了惊天的故事：“我是未来次郎你创造的机器人，回到过去来保护你免受灾难。”就这样，“她”住进了次郎家中，开始了与次郎的同居生活。灾难似乎没有离开次郎的意思，但次郎与她的感情已在其中萌发。爱与时间的感人故事，守护未来的约定，开始今天的生活。

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