In the near future, tensions have begun to rise between different countries fighting over resources and other political issues. Over time, the situation begins to worsen and threats of a potential nuclear war start to arise. As the problems are rapidly getting worse, a young boy named Arki and his family, who live in a small city in France, are living another seemingly normal day getting ready to go throughout their day, but something very bad has happened. Panic begins to spread all throughout the town as they begin to flee to underground shelters. Life underground was very different, and nobody was allowed to leave, but Arki is very curious and wants to learn more about what really happened on that horrifying day.