Mary and the Witch’s Flower (2017) | Official Trailer (English trailer here)
This is the feature film debut of Studio Ponoc, which was founded in 2015 by ex-Studio Ghibli producer Yoshiaki Nishimura and is staffed by many former Ghibli employees. The film is directed by Hiromasa Yonebayashi (When Marnie Was There, Arriety) and based on The Little Broomstick by Mary Stewart. More info at ANN.