Events take place in the distant future on the planet Diona-R027. The girl Delta is only 14 years old, she is not human. She and her guardian Horan are the last representatives from the planet Marcin. Outwardly, they are no different from people and live among them. For reasons unknown to Delta, Horan does not allow himself to be revealed to people. He teaches her to use his inhuman abilities, gradually introducing her to Knowledge. At first, Delta does not see his difference from people, but as his abilities develop, he begins to change. And curiosity often drags her into the next adventure.