Momoko, who attends a special school, is both mentally and physically disabled. Every morning she becomes peevish because she can't go to the ordinary school with her twin brother Riki.
Unfortunately the movie My Sister Momoko is not yet available on HBO Max.
| Directing | Setsuko Shibuichi | Director |
| Visual Effects | Naoyuki Taniguchi | Compositing Artist |
| Visual Effects | Kiyoshi Matsushita | Key Animation |
| Visual Effects | Tatsuo Yanagino | Key Animation |
| Visual Effects | Fumiyasu Saito | Key Animation |
| Visual Effects | Tsunenaka Nozaki | Key Animation |
| Art | Shichiro Kobayashi | Art Direction |
| Sound | Katsunori Shimizu | Sound Director |
| Writing | Katsumi Koide | Screenplay |
| Writing | Mitsuyo Suenaga | Screenplay |
| Writing | Setsuko Shibuichi | Storyboard |
| Sound | Michiru Oshima | Original Music Composer |
| Writing | Akari Hoshi | Writer |
