The Lemon class and the Strawberry class from a Barcelona school take their places on benches placed on the same stage. Teachers and chaperones ask for silence and order because the show is about to begin. "Don't tap your feet." "It's starting now." "Pay attention." "Xxt. Let's be quiet, please." Before them begins a simple and tender puppet show, with live music, careful lighting, and minimalist sets that transport them to a completely new universe: the life of Numa and the rag rabbit his mother gives him, with whom he lives imaginary adventures.