In 2100, the empire of Mortemonde colonize almost all the nations of the Earth and reduce their populations to slavery. The slaves are constrained to collect 1000XP every month in Battledream, a video game where we can die for real. Only those who succeed receive the right to live until the next month. Syanna, a young martinican slave, refuses to keep living in this condition and decides to fight to regain her freedom...