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.
| Directing | Goro Miyazaki | Director |
| Production | Toshio Suzuki | Producer |
| Writing | Diana Wynne Jones | Novel |
| Visual Effects | Katsuya Kondo | Character Designer |
| Sound | Koji Kasamatsu | Sound Director |
| Crew | Yukinori Nakamura | CG Supervisor |
| Art | Yuhki Takeuchi | Background Designer |
| Sound | Eriko Kimura | Recording Supervision |
| Sound | Sherina Munaf | Vocals |
| Sound | Hiroki Kamemoto | Musician |
| Sound | Kiyokazu Takano | Musician |
| Sound | Kavka Shishido | Musician |
| Sound | Satoshi Takebe | Original Music Composer |
| Sound | Satoshi Takebe | Keyboard Programmer |
| Visual Effects | Tan Seri | Animation Director |
| Writing | Goro Miyazaki | Screenplay |
| Visual Effects | Yusuke Hirota | Animation |
| Production | Isao Yoshikuni | Production Supervisor |
| Production | Keisuke Tsuchihashi | Production Supervisor |
| Production | Koji Hoshino | Production Supervisor |
| Writing | Keiko Niwa | Screenplay |
