The childhood of the movie director Antoine Lisner, who left Algeria in 1962. In order to present his new movie, he comes back to Algiers with his son.

The LT-21 virus hits France and starts spreading worldwide. It won't cause a single death. But are we still fully alive when we've forgotten everything? Because infected patients develop total retrograde amnesia. Asia and Gabriel, a couple of doctors, do everything to stop the epidemic and protect the patients held in a hospital under military surveillance.

On his 13th birthday, Ulysse is about to make a revelation.