A young but sterile man suddenly wants to be a father. A friend calls this the "kangaroo complex," because male kangaroos do not have pouches to carry their offspring. So Loic (Roland Giraud), goes looking for a solution to his "complex." He cannot have children himself because of a bad case of the mumps when he was in his mid-20s. That does not leave many options open to him until he accidentally comes across his old girlfriend with her 6-year-old son and notes that the little boy looks a lot like him. It does not take much to convince him that the boy is his own but once having reached that conclusion, the rest of his plan for new-found fatherhood is loaded with pitfalls.