《无人知晓》是由是枝裕和执导，柳乐优弥,北浦爱,木村飞影,清水萌萌子主演的剧情片。该电影于2004年在日本上映。新搬来的公寓这家人是母亲惠子（You饰）带着四个孩子：明（柳乐优弥饰）、京子、茂、雪。但母亲却得对周围的人们撒谎说丈夫去海外工作，自己与长子两个人在一起生活。事实是其它三名弟妹是“黑孩子”，因为四个孩子有着各自不同的父亲。他们一直呆在家中，没有去学校上学。在母亲去百货商店工作时，年纪尚小的明就在家中代替母亲行使家长的职责。突然有一天母亲不见了，她把手中仅有的20万日元现金和一张短短的便条留给了孩子们，把弟妹托付给明看管后，就悄然地离家出走。无亲无故，对外面几乎一无所知的四个孩子们，要开始面对新的生活，那实在不是件容易的事情……
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