Justine, Armel, Camille and Félix are four thirty-somethings who live in Brussels. Friends for years, they are beautiful, they have a situation, they are alive. But at thirty years old, even the smallest grain of sand can stop the machine. The same day Faustine is challenged in her work, Camille becomes pregnant, Armel loses his father and Félix is called to work in Tokyo. It's raining sand in Brussels.