Single father Kenichi has raised his daughter Miki alone for the past ten years, from when she attended nursery school until her graduation from elementary school. Kenichi is currently 30 years old. His wife Tomoko died at a young age and he has raised Miki alone since that time. While raising his daughter alone, he has encountered various problems.

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健一（山田孝之 飾）的女兒美紀出生後不久，妻子就突然因病去世，留下健一和美紀兩人相依為命。妻子的雙親勸他再婚，並想把孫女美紀接去撫養，但是健一還是決定以一己之力照顧女兒。從托兒所到小學畢業，時光流轉中所捕捉到的，是單親爸爸的奮鬥和女兒成長中留下的足跡。儘管這十年間，健一的生活中出現過願意成為美紀母親的女性，但對亡妻的思念情感，讓健一始終無法做出決定。