In a world where books and cars share a sales floor, a misanthropic and immortal bookselling demon is forced to team up with a young, enthusiastic human assistant to save his bookstore.

Hubert is a good-looking guy and a well-known, talented tattoo artist. Love isn't one of his top priorities, and neither is family. And then there's Fanny, a hard-working, dedicated social worker who has trouble keeping her working life separate from her private life. Guillaume, her boyfriend of the last seven years, understands her and gives her his unconditional support. They're trying for their first baby. So nothing predestined Hubert and Fanny to meet. But during a hold-up, they experience the most intense emotions they've ever felt. During the time when they're fearing for their lives, they rely on each other to survive. After the event, an irresistible desire to see each other again compels them to wonder whether spending a few hours together is really enough to change the course of their lives.​​​​​​

A pair of rival butterflies form an unlikely friendship.