One Summer's Day
Absent-minded fifth-grader Yuta is sent to spend the summer with his grandfather, whom Yuta's parents think is becoming senile and could benefit from Yuta's companionship. At first, Yuta thinks Gramps is a bit addled, too, but as he gets to know the old man better, he finds that his grandfather sees things quite differently from others.
Top cast
Takuro AtsukiYuta Ooi
Keiju KobayashiKenshiro Ooi
Kin SugaiYuta's grandmother
Kyusaku ShimadaMasahiro Ooi
Miyuki MatsudaKaori Ooi- Nanami SanoErika Ooi
Kanae KatsunoMikari Kobayashi
Hikari IshidaYumi Shina
Aoi MiyazakiTama Kobayashi- Katsuya KoisoOctopus boy
- Shinya YamamotoHarunosuke (azuki shop owner)
- Shiho AkutagawaHarunosuke's Daughter
Below are the streaming services currently carrying the movie “One Summer's Day” in the United States, along with how each offers it (subscription, buy, or rent) and a direct link. Licensing differs by market, so availability in the United States can differ from other countries.
Where to watch One Summer's Day in United States
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Not currently available on the supported providers in United States.
Availability can change as licenses rotate — confirm on the provider’s page before subscribing. Last checked: 22 Sept 2026.