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.
Is My Sister Momoko on Netflix? Unfortunately the movie My Sister Momoko is not yet available on Netflix.
| Directing | Setsuko Shibuichi | Director |
| Visual Effects | Naoyuki Taniguchi | Compositing Artist |
| Visual Effects | Kiyoshi Matsushita | Key Animation |
| Visual Effects | Tatsuo Ryuno | 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 | Mitsuyo Suenaga | Screenplay |
| Sound | Michiru Oshima | Original Music Composer |
| Writing | Setsuko Shibuichi | Storyboard |
| Writing | Katsumi Koide | Screenplay |
| Writing | Akari Hoshi | Writer |
