A grumpy street musician bear, Ernest, lives a quiet life with Celestine, a cheerful and fearless little orphan mouse. Together, they share a world full of grumbles, laughter, and surprises in their slightly ramshackle home. While Ernest struggles with his superstitions and bad moods, Celestineleads him into adventures full of curiosity, drawings, and mischief. Their unlikely friendship sparks stories where tenderness and humor intertwine, challenging preconceived notions and celebrating differences.