The life of Aya, a spirited 10-year-old orphan, is turned upside down when she finds herself adopted by Bella Yaga and Mandrake, a strange and disturbing couple. Bella Yaga turns out to be a witch in search of a new assistant. Aya accepts, but soon realizes that she is only the witch's slave and that her magic lessons are not coming.

With the help of Thomas, the witch's cat, who has also been mistreated, she will roll up her sleeves and try to turn the situation around in her favour!

Aya and the Witch, adapted from Diana Wynne Jones' novel Earwig and the Witch, is Studio Ghibli's first feature film in 100% 3D.