The film opens on Gaspard, a young man, sitting on his couch with his friends.

He receives a text from a mysterious M asking him to take her to dance.

With a little help from his friends, he will bring his best efforts to learn how to dance and become a real Fred Astaire to honor his rendez-vous.

At the end of the film, we discover that this mysterious M is actually his grandmother who seems thrilled to be escorted by her grandson to the dance.