Maeterlinck no Aoi Tori: Tyltyl Mytyl no Bouken Ryokou

Synopsis

On a snowy Christmas Eve, Tyltyl and Mytyl remain at home, their usual festive spirit dampened by their mother's illness. Unable to sleep, they are suddenly visited by Berylune, a strange and mercurial magical spirit who bursts through their window to reveal that their world is not the only one in existence. Guided by Berylune and accompanied by various spirits along with their pets, who have taken on humanoid forms, the two siblings embark on a quest to locate the Blue Bird of Happiness and cure their mother. Their journey takes them through a series of strange and wondrous lands, culminating in a final confrontation with the spirit of darkness as they strive to achieve their elusive goal.