Beautiful Rain

One day a father with a young daughter is diagnosed as a sufferer of early-onset Alzheimer's disease. The father, Kinoshita Keisuke has been separated from his wife by death and has worked at the factory's dorm with his daughter ever since. A skilled craftsman at the metalworking factory, Keisuke is a man with a sunny disposition who is also the team coach for a boys' baseball team. Surrounded by his friends of the neighborhood, he has lived happily with his daughter up until today. Things take a turn when Keisuke realizes that his forgetfulness has taken its toll. He is diagnosed as having early-onset Alzheimer's disease. His daughter, Kinoshita Miu played by child actor prodigy Ashida Mana, is a strong reliable girl on the outside but still a young and vulnerable girl on the inside. Overcoming her mother's death with her cheerful personality much like her fathers', she too must face the consequences of the sickness with her father... A father who has looked after his daughter by himself all this time and a daughter who held faith in her father even without the existence of her mother. Tied to each other by a strong bond, how will they face reality and overcome it?

木下圭介は妻の病死で、娘と2人で暮らしている。最近、軽度の記憶障害に悩まされていたが、「若年性アルツハイマー病」だと医師から診断が下される。娘・美雨（みう）は母親・妙子がいなくても、父が一緒なら大丈夫だと信じて生きてきた。しかし、圭介が突然難病におかされることで親子の生活は一変する。

木下圭介（豐川悅司飾）喪妻，成為單親爸爸照顧女兒美雨（蘆田愛菜飾）和她一起生活。他辭去了大型建築公司的工作，在下町的金屬加工工場「中村産業」當技師，並擔任少年棒球隊的教練。圭介性格開朗受周圍的朋友及同事愛戴，與女兒一起過着快樂的生活，但漸漸變得容易忘記事情，某天他被診斷患上早年性阿茲海默病，亦即腦退化症或老人痴呆症，開始改變二人的生活，但加深了二人的親情，一起跨越障礙。