Maeterlinck no aoi tori: Tyltyl Mytyl no bôken ryokô

The series is about a 12-year-old girl called Mytyl and her 13-year-old brother Tyltyl seeking happiness, represented by The Blue Bird of Happiness, aided by the good fairy Bérylune. They are accompanied on their journey by their cat and dog, Shanet and Tyrol, who are given anthropomorph forms and the ability to talk by Bérylune.