Vasily unexpectedly finds himself in another world. He barely remembers his previous life and does not understand how he ended up in Milerum, a kingdom where things are made of stone! It turns out that Vasily, aka Vos, appeared here for a reason. He was carried by a powerful magician named Kwanno. The magician makes Vos an offer that is impossible to refuse - to become the magician's student and serve his granddaughter Sidon, the ruler of the feudal kingdom. Vasily finds out too late that the oath given out of frivolity is accompanied by a spell that will kill the traitor before he can betray...