The plot of "Bonne Chance" revolves around a woman who walks through the streets, asking people to wish her good luck without revealing the reason why. Despite her efforts, people refuse to offer their well-wishes. Feeling disheartened, she decides to try her luck with a lottery ticket. Just when she seems to have given up hope, a stranger passes by and finally wishes her good luck. The film explores themes of human connection, empathy, and the unexpected moments of kindness that can brighten someone's day.