A year has passed since the end of Tibidox. Time has scattered everyone, mixed everything up. Tanya and Yagun remained in graduate school. Seven-Stump-Holes, Popugaeva and Zalizina moved to the world with the moronoids. Grobynya Sklepova and Gunya settled on Bald Mountain. Vanka climbed into the wilderness of the forest and lives away from the world, communicating only with leshaks. True, sometimes the Cupids bring letters from him to Tanya... The restless Yagun has the idea of organizing an evening of alumni reunion and bringing the whole course together. And now the invitations have been sent out, the guests have gathered. It would seem that everything is as before, but not quite... Immortelle Koshcheev wants to move the school from Buyan Island to the Arctic, where there is permafrost. To do this, he sends the auditor Zerbagan to Tibidox, who is connected with the island by a certain secret...