A forty-year-old, completely immature Adrien, is abandoned by dreaming of starting a Maude family. The vision of the end of great love is unbearable for him. Thanks to a favorable coincidence, he decides to stay in their shared apartment and set up ... a home kindergarten. Toddlers turn his life carefree upside down, learning about his survival art in his company. The new face of the "soon-to-be-husband" makes the wall around the heart of Maude begin to crumble ...