前原真记和弟弟宏、父亲道夫三人一起生活。母亲多惠在 18 年前为了另一个男人弃家而去，但父亲从未吐露过一句对母亲的怨恨。道夫突然过世后，真记在电脑里写下自己的心情：“母亲，和那个人在一起，您过得幸福吗？父亲已经离去了，什么都没有说。”偶然的机会宏发现了这篇文章，瞒着真纪寄给了“日本最短的给母亲的信”作文大赛。宏也从此开独自寻找母亲，终于迎来和母亲的相逢…。"Mother, are you happy with him? Father said nothing and died quietly." Hiroshi borrows his sister Maki's laptop computer and finds a short message written to the mother who had abandoned them. Without telling Maki, Hiroshi submits her message to a Fukui prefecture collection, and it wins a prize. The episodic narrative gradually fills in the background to this message. She goes from being a design company employee to a restorer of medieval art works. He is a university student in Tokyo. Their father died of a heart attack and never spoke about the divorce from their mother. Hiroshi meets the mother and tries to bring her back to the family, despite Maki's violent objection.
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