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 |
| Art | Shichiro Kobayashi | Art Direction |
| Writing | Setsuko Shibuichi | Storyboard |
| Writing | Mitsuyo Suenaga | Screenplay |
| Writing | Akari Hoshi | Writer |
| Writing | Kazumi Koide | Screenplay |
| Sound | Michiru Oshima | Original Music Composer |
| Visual Effects | Kiyoshi Matsushita | Key Animation |
| Visual Effects | Tatsuo Yanagino | Key Animation |
| Visual Effects | Naoyuki Taniguchi | Compositing Artist |
