An unknown monster nicknamed Chupacabra stole the sword from Art. In pursuit of Chupacabra the characters end up in a mysterious place — an island outside the main game. Here, Chupacabra hides inside a strange artifact — a cube, which is able to change the properties of the game. The heroes cannot get Chupacabra out, so they take the cube with them to solve the puzzle at the lesson. Meanwhile, in the classroom it’s time to choose a new headman. And proud Art cannot just pass by, when it turns out that instead of Mark they want to choose him.