Society as we know it is dead, the world has changed, and everyone has the choice between adapting immediately or disappearing. A few survivors have taken refuge in a shelter away from outside dangers. Their survival is ensured by a machine that produces electricity, an extremely rare resource in these desolate times. One morning, the group discovers with horror that their machine has been destroyed. The hunting party is on: the six companions must venture outside their shelter and immediately find a cable to operate the machine. This expedition, on which their survival depends, will lead them straight to a mysterious group of individuals who intend to prevent them from returning home.

William, 18, is a shy young man trying to forge an identity and find his place in the world around him. It's the beginning of summer, and he's been invited to Plume's house for a small end-of-year party. This evening was supposed to mark the end of a period they spent together before the start of their student life, but the events that are about to unfold are likely to surprise the group of friends and give this joyful moment a completely different twist.