De tienjarige Earwig woont in een weeshuis in Engeland en is zich niet bewust van het feit dat haar moeder over magische krachten beschikte. Op een dag wordt Earwig door de heks Bella Yaga geadopteerd en gedwongen om met deze egoïstische vrouw samen te leven. Het meisje poogt haar nieuwe thuis te ontvluchten.
Ja! de film Aya and the Witch is nu beschikbaar om te kijken op Netflix in Nederland.
| Production | 吉國勲 | Production Supervisor |
| Production | 土橋圭介 | Production Supervisor |
| Production | 星野康二 | Production Supervisor |
| Visual Effects | 廣田裕介 | Animation |
| Writing | 丹羽圭子 | Screenplay |
| Directing | 宮崎吾朗 | Director |
| Production | 鈴木敏夫 | Producer |
| Writing | Diana Wynne Jones | Novel |
| Sound | Koji Kasamatsu | Sound Director |
| Visual Effects | 近藤勝也 | Character Designer |
| Crew | Yukinori Nakamura | CG Supervisor |
| Sound | 木村絵理子 | Recording Supervision |
| Art | Yuhki Takeuchi | Background Designer |
| Visual Effects | Tan Seri | Animation Director |
| Sound | Sherina Munaf | Vocals |
| Sound | 武部聡志 | Original Music Composer |
| Sound | 武部聡志 | Keyboard Programmer |
| Sound | 髙野清宗 | Musician |
| Sound | Hiroki Kamemoto | Musician |
| Sound | シシド・カフカ | Musician |
| Sound | 鈴木修二 | Sound Recordist |
| Writing | 郡司絵美 | Screenplay |
| Visual Effects | Yoga Priyanto | Animation |
| Visual Effects | Putri Yunita Samsu | Animation |
| Visual Effects | Nicolas Dufresne | Animation |
| Visual Effects | Frances Sie | Animation |
| Visual Effects | Chris Tao | Animation |
| Visual Effects | Howard Shih | Animation |
| Visual Effects | Kwan Cho-Fai | Animation |
| Visual Effects | Hsu Tsu-chi | Animation |
| Visual Effects | Lee Sing-yee | Animation |
| Visual Effects | Chai May-teng | Animation |
| Visual Effects | Cheng Yin-hong | Animation |
