Some call them simply immortal, others demons, others spirits or devas. They themselves prefer the name "primus," which means "first" in Latin. When Ariana is attacked by a mysterious stranger, whose will everyone around her suddenly begins to obey, the girl's life changes forever. Ariana learns that the lyceum in which she studies is run by the secret organization "Pleiades." She controls primus and protects humanity from them for many centuries. But it seems that Ariana herself has a special power. And in order to escape from the one who opened the hunt for her, the girl will have to use the help of the demon himself...