The eighth-grade pupil Kirill Grishin accidentally turns a physical education class into a political action. It would have remained an insignificant school incident, if only his parents hadn’t found out.

Ancient Rus. The hero Svyatogor defeated the evil Sorcerer who wanted to conquer Rus - to do this, he used magic to turn into a Dragon. Svyatogor hid three artifacts (the claw, eye, and vein of the Dragon) in the modern world so that evil would never return. But because of the schoolboy Vanya, the Sorcerer's beloved enters our time. She wants to find these artifacts, resurrect the Dragon, and bring her betrothed back to life. Together with two heroes from ancient Rus, Vanya must find the villain and prevent her from carrying out her plan.