Shunsuke Ozaki (Naoto Ogata) is 47. A department head at a large electronics manufacturer, he is a capable man trusted by his subordinates. At home are Akiko (Kaho Minami), his beautiful wife, their son and daughter Daisuke (Masato Yano) and Sakiko (Karen Miyama), and his father Shuntaro (Tatsuya Fuji). Wanting for nothing, the family should be happy, but Shunsuke is absorbed in his work and has long left everything at home to Akiko. Their relationship has cooled since she discovered a now-ended affair, and he doesn’t talk to Daisuke, who rather than going on to university is working at a series of part-time jobs. He talks to Sakiko, but she usually responds with little more than her trademark ‘whatever’. The possibility of a major promotion makes him ignore his family even more.
But now something significant happens. A frantic telephone call from Akiko brings him home to a shocking sight. Shuntaro kneels in the hall, trembling, in a pool of his own filth. Akiko has left him there, making no move to clean him up, and Shunsuke shouts angrily at her.
Later Shuntaro recovers himself and apologizes to Akiko. ‘Am I going senile?’ he asks.Realizing at last that there is something wrong with Shuntaro, he talks to his father, who says that he has been incontinent for some time, and that he wears adult diapers bought for him by Daisuke. Daisuke is also disposing of the soiled diapers so that no one else in the family will find out. But from this time on, Shuntaro’s condition grows rapidly worse. With the meeting that will decide his promotion coming the following week, Shunsuke makes the bold decision to take the family on a trip. Practically shoving his bewildered family members into their van, he sets out for Shuntaro’s childhood home in distant Fukui Prefecture. Leaving the urban wilderness of Tokyo for the beautiful scenery of Nagano and Fukui, the family members begin to relax with one another. Daisuke, it turns out, understands Shuntaro better than anyone else, while Sakiko has been convinced for years that Shunsuke has absolutely no time for her. The more of these secrets he learns, the happier Shunsuke becomes. It is like a couple of taps have been turned on in his dry soul.
But while the children gradually begin to enjoy this strange impromptu family trip, Akiko remains shut away in herself. Finally she reaches the end of her patience, and announces she is going back home. She and Shunsuke have their first serious conversation in years. The one-time affair is not the problem; it’s his attitude, and the way he has left the house and family entirely to her. This collision, their first in a long time, leaves Akiko in tears, and Shunsuke is deeply moved.
‘That’s what Dad meant when he said I wasn’t innocent, either.’ Now the tap squeezed most tightly shut comes open.
Now comes another surprise. Shuntaro, off in another world for most of the trip, suddenly comes back to reality.
‘What are you all doing? Where are we?’ The other four burst out laughing.
But learning that this is a trip back to where he spent his childhood, Shuntaro starts to look anxious. Knowing that he suffers from dementia, he no longer trusts his own memory.
Where will this family trip lead them? There is a miracle awaiting them at its end.

大手家電メーカーに勤める大崎俊介(緒方直人)は部下からの信頼も厚く、将来を嘱望される会社員だ。
重役への出世も目前で、生活は順風満帆なように思えた。
しかし、気付けばその家庭は多くの問題を抱えていた。妻・昭子(南果歩)との関係は冷え切り、二人の間には何年もろくな会話がない。息子の大介(矢野聖人)は、大学受験に失敗してからアルバイトを転々としており、家に帰っても逃げるように自分の部屋に閉じこもってしまう。娘の咲子(美山加恋)は高校生だというのに毎晩帰りが遅く、俊介の忠告も聞かず何を考えているのかわからない。俊介が仕事に追われている間に、家族は確実にバラバラになりかけていた。
周りを見つめるきっかけになったのは、父・俊太郎(藤竜也)が老人性認知症を患ったことだった。大雨の夜、俊太郎は徘徊しているところを警察に保護され、この日を境におかしな行動が増えていく。苦しむ俊太郎を見ても家族は見て見ぬふりで、一切助けようとはしなかった。薄情な家族に俊介は大きく失望し、孤独な父を守ろうとひとり奮闘する。しかし実は、息子の大介が人知れず俊太郎を介護していたことを知る。家族の事を何も考えていないと思っていた息子の優しさあふれる行動を見て、俊介は家族の事を見ようとしていなかったのは自分の方だったと、初めて気付かされる。
ある晩俊介は、俊太郎の遠い過去の物語を聞く。
「家族と暮らした思い出は、敦賀のあのお寺だけだ。春、桜の花が満開で美しかった。」
あいまいな様子で、それでもしっかりとした口調で大事そうにその思い出を語る父を見て、俊介は決意する。
父の遠い記憶を探すため、家族のそれぞれを見つめてまたやり直すため、一家は一台のワゴン車に乗り込み、みんなで初めての旅に出る――。