One Summer's Day (1999) 

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.

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DETAILS

Takuro Atsuki Yuta Ooi

Keiju Kobayashi Kenshiro Ooi

Kin Sugai Yuta's grandmother

Kyusaku Shimada Masahiro Ooi

Miyuki Matsuda Kaori Ooi