An unknown monster nicknamed Chupacabra stole Art's sword. In pursuit of Chupacabra, the heroes find themselves in a mysterious place - an island outside the main game. Here, Chupacabra hides inside a strange artifact - a cube that can change the properties of the game. The heroes fail to get Chupacabra, and they take the cube with them to solve a puzzle in class. Meanwhile, it's time for the class to choose a new class monitor. And proud Art can't just pass by when it turns out that they want to choose him instead of Ilya.
