在自己家开办钢琴教室的梅田美奈（尾野真千子）的身边，迎来了一位和母亲一同前来的新学生。但是，意识到孩子并不喜欢音乐之后，美奈觉得就算勉强也不会有什么长进，便没再想方设法去培养孩子的兴趣，就这么结束了课程。孩子母亲觉得美奈辜负了自己的期望，斥责她说道 “亏我还是听说你是有名指挥家的女儿才来的！”，说完就气冲冲地带着孩子回去了。未作任何反驳，低头致歉送走那对母子之后，美奈一头钻进了洗手间。啊啊啊啊啊啊啊！美奈对着马桶一阵大喊。这是无人知晓的美奈的日常状态。那天晚上，美奈听回到家的丈夫信次（江口洋介）说，传言附近有翻腾垃圾箱的不明生物出没。比起主谋究竟是心理变态这还是什么危险生物，美奈现在更在意的是近期某项国际比赛。从十几岁的时候起，她连做梦都想得到的一份奖。对迄今为止经历了49连败，迎来了35岁人生的美奈而言，这也将是最后一次参赛。在美奈下定决心正潜心练琴的时候，丈夫之前提到的不明生物潜入了自家的院子。战战兢兢地确认其真实面目发现，那竟然是一个小男孩！小男孩的衣服和身上都很脏，而且面无表情一言不发，根本搞不清来历。不过，看到他狼吞虎咽地吃下面包圈的样子，倒是知道他还饿着肚子。之后，了解到这孩子受到了父母的虐待。这一个多月，其父母也不见了踪影，小男孩被送到了福利设施里。又过了几天，不知为何小男孩又出现在了梅田家的院子里。这个依旧是一言不发、甚至连名字都无从知晓的小男孩，再次来到自己家里，让丈夫觉得是命运使然，于是开始暗中调查收养子女的相关事宜……
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